The sum of interior angles of the given 22 sided convex polygon is; 3600°
What is the sum of interior angles of a polygon?When it comes to finding the sum of the interior angles of a a convex polygon that has n sides, we can say that its interior angle sum is given by the following equation:
S = ( n − 2) × 180°.
where;
n is the number of sides of the convex polygon
Thus, for a 22 sided convex polygon;
S = (22 - 2) × 180°
S = 20 × 180°
S = 3600°
That represents the sum of interior angles of the given polygon.
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PLEASEHELP WITH PROBLEMS
In order to maximize profit the firm should produce 4 or 5 units.
The marginal revenue and the marginal cost are the same at quantity 6.
The marginal revenue curve and the marginal cost curve cross at a quantity 6.
The firm loses in a competitive industry because marginal revenue is decreasing as quantity increases.
The industry is in a long-run equilibrium.
True.
The graph is given below.
What is an expression?An expression is a way of writing a statement with more than two variables or numbers with operations such as addition, subtraction, multiplication, and division.
Example: 2 + 3x + 4y = 7 is an expression.
We have,
Marginal cost = Change in cost / Change in Quantity
Marginal Revenue = Change in Revenue / Change in Quantity
Profit = Marginal revenue - Marginal cost
Now,
Quantity Total cost Marginal cost Total revenue Marginal revenue Profit
0 5 0
(6 - 5)/(1 - 0) = 1 (6 - 0)/(1 - 0) = 6 (6 - 5) = 1
1 6 6
(8 - 6)/(2 - 1) = 2 (12 - 6)/(2 - 1) = 6 (6 - 2) = 4
2 8 12
(11 - 8)/(3 - 2) = 3 (18 - 12)/(3 - 2) = 6 (6 - 3) = 3
3 11 18
(15 - 11)/(4 - 3) = 4 6 (6 - 4) = 2
4 15 24
(20 - 15)/(5 - 4) = 5 6 (6 - 5) = 1
5 20 30
(26 - 20)/(6 - 5) = 6 6 (6 - 6) = 0
6 26 36
(35 - 26)/(7 - 6) = 9 6 (6 - 9) = -3
7 35 42
We see from the table,
There is no profit when the quantity is 6 and 7.
So,
In order to maximize profit the firm should produce 4 or 5 units.
Now,
From the table,
The marginal revenue and the marginal cost are the same at quantity 6.
The marginal revenue curve and the marginal cost curve cross at a quantity 6.
Now,
The firm loses in a competitive industry because marginal revenue is decreasing as quantity increases.
Now,
Since the marginal cost is the same.
The industry is in a long-run equilibrium.
True.
Now,
The marginal cost equation.
y = x + 0.5
i.e
(0.5, 1) and (1.5, 2)
y = mx + c
m = (2 - 1)/(1.5 - 0.5) = 1/1 = 1
1 = 1 x 0.5 + c
c = 1 - 0.5
c = 0.5
The marginal revenue equation.
y = 6
i.e
(0.5, 6) and (1.5, 6)
m = 0
6 = 0 x 0.5 + c
c = 6
The graph is given below.
Thus,
The statement is given above.
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Liliana has $3.60 in nickels and quarters in her backpack. She has 18 more nickels than quarters. How many coins of each type does she have?
Answer: Liliana has 9 quarters and 27 nickels.
Step-by-step explanation:
Let's call the number of quarters Liliana has "q" and the number of nickels she has "n".
From the problem, we know that:
n = q + 18 (because she has 18 more nickels than quarters)
We also know that the total value of the coins is $3.60. We can use the following equation to find the total number of coins:
(0.25 * q) + (0.05 * n) = 3.60
Now we can substitute the first equation into the second equation to get:
(0.25 * q) + (0.05 * (q + 18)) = 3.60
Simplifying this equation:
0.25q + 0.05q + 0.90 = 3.60
0.30q = 2.70
q = 9
So Liliana has 9 quarters. We can use the first equation (n = q + 18) to find the number of nickels she has:
n = 9 + 18
n = 27
Which means, Liliana has 9 quarters and 27 nickels.
Given the figure below shows a regular hexagon, ABCDEF
What is the measure of each interior angle?
in a survey it was found that studnets are talented at playing football. After assessment by coaches it was seen that 5% students possess football skills classed at professional level. A random sample of 10 studnets is obtained from the campus and measurements of their football skills were taken. Find the probability that 8 or more of these stundents were classed at professional level. the picture of quetsion is attached i have sloved the rest just cannot solve part d).
The probability that 8 or more of these students were classed at professional level is given as follows:
0%.
What is the binomial distribution formula?The mass probability formula, giving the probability of x successes, is of:
[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]
[tex]C_{n,x} = \frac{n!}{x!(n-x)!}[/tex]
The parameters are given by:
n is the number of trials of the experiment.p is the probability of a success on a single trial of the experiment.The values of the parameters for this problem are given as follows:
n = 10, p = 0.05.
Hence the probability of 8 or more of these students were classed at professional level is given as follows:
P(X >= 8) = P(X = 8) + P(X = 9) + P(X = 10)
In which:
P(X = 8) = 45 x (0.05)^8 x 0.95² = 0.P(X = 9) = 10 x (0.05)^9 x 0.95^1 = 0.P(X = 10) = 0.05^10 = 0.Hence the probability is of 0%.
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In science class, Farah uses a graduated cylinder with water in it to measure the volume of some marbles. After dropping in 4 marbles, the height is 10 mL. After dropping in 6 marbles, the height is 11 mL. How much does the height increase for each marble? 0.5 mL How much water was in the cylinder before any marbles were dropped in? mL wwwww Submit
The volume of one marble is 0.5 ml and the water level before dropping the marbles is 8 ml.
Finding Volume by Water Displacement Method:The volume of an object is the amount of space occupied by the object within all boundaries. The volume of any geometrical shape can be calculated by the respective formula.
The Water Displacement Method is a method that is used to calculate the volume of any object without knowing the dimensions. If we drop the object into the water and the amount that can be displaced will be equal to the volume of the object.
Here we have
After dropping 4 marbles, the height of the water level is 10 ml
After dropping 6 marbles, the height of the water level is 11 ml
This means for 2 extra marbles the water level increase up to 1 ml
So, the Volume of the marble = 1 ml/2 = 0.5 ml
From the given data,
After dropping 4 marbles the water level is 10 ml
As we know the volume of 1 marble = 0.5ml
=> Volume of 4 marbles = 4 × 0.5ml = 2ml
The water level before dropping 4 marbles = 10 ml - 2 ml = 8 ml
Therefore,
The volume of one marble is 0.5 ml and the water level before dropping the marbles is 8 ml.
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bridge is a card game in which the deck of 52 cards is randomly and equally divided among the 4 players. so each player gets 13 cards.
The formula for calculating the number of cards each player receives in Bridge is N/4, where N = number of cards in the deck.
For a standard deck of 52 cards, each player would receive 52/4 = 13 cards. This can be further simplified to 13.33, however, since cards cannot be divided, the result is rounded down to 13 cards. Therefore, each player in a Bridge game with a standard deck of 52 cards will receive 13 cards.
The total number of cards in the deck is 52, so each player will get 13 cards. This can be expressed mathematically using the formula P = 52/4, where P is the number of cards per player. Therefore, P = 13. We can also use the formula to calculate the number of players if we know the total number of cards. For example, if we have 156 cards, the number of players can be calculated using the formula P = 156/4, which gives us P = 39. Therefore, there will be 39 players in the game.
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declare double variables x1, x2, x3, and x4, and read each variable from input in that order. find the average of x1, x2, x3, and x4 and assign the result to avgnumber.
The answer is x4 = input.nextDouble() and double avgnumber = (x1 + x2 + x3 + x4) / 4.
Declare the double variables x1, x2, x3, and x4.
double x1, x2, x3, x4;
Read each variable from input in that order.
Scanner input = new Scanner(System.in);
System.out.println("Enter x1:");
x1 = input.nextDouble();
System.out.println("Enter x2:");
x2 = input.nextDouble();
System.out.println("Enter x3:");
x3 = input.nextDouble();
System.out.println("Enter x4:");
x4 = input.nextDouble();
To Find the average of x1, x2, x3, and x4 and assign the result to avgnumber.
double avgnumber = (x1 + x2 + x3 + x4) / 4;
//This code takes four double variables from input and calculates the average by adding the four numbers together and dividing by four. The result is stored in the double variable avgnumber.
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Paula who is 49 years old is seven times older than her son, Daniel.Daniel is two years younger than his sister, Leah. How old is Leah?
segment vu is parallel to segment lm. find the missing length. segment vu is parallel to segment lm. find the missing length. 44 27 24 39
The missing length of segment VU is 33.49.
The formula for finding the missing length of two parallel lines is given below:
L = L1 + (L2 - L1) * (L3/L4)
Where L1 is the length of one line, L2 is the length of the other line, L3 is the known length of the first line, and L4 is the known length of the second line.
In this problem, L1 is the length of segment LM and L2 is the length of segment VU. We know that L3 is 24 and L4 is 39.
Using the formula, we can calculate the missing length of segment VU as follows:
L = 44 + (27 - 44) * (24/39)
L = 44 + (-17) * (0.61538)
L = 44 - 10.51
L = 33.49
Therefore, the missing length of segment VU is 33.49.
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solve 5+2x+12=4x+17-2x
Answer:
2x-4x+2x=17-12-5
0x=0
4. If a tablet PC had a net cost of $453.60 after a series discount of 20/10/10, what
was the list price of the PC?
The series discount of 20/10/10 means that there are three discounts given in sequence. The first discount is 20%, the second is 10%, and the third is 10%.
What does math's % mean?
In essence, percentages are fractions with a 100 as the denominator. We place the percent symbol (%) next to the number to indicate that the number is a percentage. For instance, you would have received a 75% grade if you answered 75 out of 100 questions correctly on a test (75/100).
Let's call the original price x.
x - (20/100x) = 0.8x
then
0.8x - (10/1000.8x) = 0.72x
and finally
0.72x - (10/100*0.72x) = 0.648x
So, the net cost of $453.60 is equal to 0.648x.
We can find the original price by dividing the net cost by 0.648:
x = $453.60 / 0.648 = $700
So, the list price of the PC was $700.
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given the system of linear equations, written in column form as follows which of the following is the corresponding row form of this system?
The row form of the system is 5x = 2 and y – y = 0.
Column form:
3x + y = 5
2x – y = –3
Row form:
3x + 2x = 5 – 3
y – y = 0
The row form of this system is 3x + 2x = 5 – 3 and y – y = 0. To convert from column form to row form, the first step is to eliminate the y terms in the equations. To do this, we need to add the two equations together. This gives us:
3x + y = 5
2x – y = –3
3x + 2x = 5 + (–3)
y – y = 0
5x = 2
y – y = 0
Finally, we can solve for x and y.
5x = 2 ⇒ x = 2/5
y – y = 0 ⇒ y = 0
Therefore, the row form of the system is 5x = 2 and y – y = 0.
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Three vertices of a parallelogram are shown in the figure below.
Give the coordinates of the fourth vertex.
(-5,-5)
(2,7)
(0, -3)
For it to be parallel, the point must follow the translation from (2,7) to that point similar to (0, -3) to (-5, -5) which is left 5 and down 2. So left 5 and down 2 for (2, 7) makes it (-3, 5)
find values of a, b, and c (if possible) such that the system of linear equations has a unique solution, no solution, and infinitely many solutions. (if not possible, enter impossible.) x y
The solution of the system of linear equations has infinitely many solutions.
Linear equation is defined as an algebraic equation of the form y=mx + b. involving only a constant and a first-order term, where m is the slope and b is the y-intercept.
Here we have given that the following linear equations are given then are listed as follows:
x + y = 4
y + z = 4
x + z = 4
ax + by + cz = 0
Here we have know that the sub-system consisting of 3 first equations has a unique solution x = y = z = 2.
While we add the fourth equation, then it becomes look like as follows:
=> 2a + 2b + 2c = 0
When we simplify this one then we get,
=> a + b + c = 0.
Which means that if a + b + c = 0, then the system of 4 equations has a unique solution otherwise it is IMPOSSIBLE to this system to have infinitely many solutions.
Complete Question:
Try to find values of a, b, and c (if possible) such that the system of linear equations has a unique solution, no solution, and infinitely many solutions. (If not possible, enter IMPOSSIBLE.)
x + y = 4
y + z = 4
x + z = 4
ax + by + cz = 0
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solve for . assume is a matrix. do not use decimal numbers in your answer. if there are fractions, leave them unevaluated.
The value of X in the given system of matrix is,
[tex]X=\left[\begin{array}{ccc}\frac{-97}{145}&\frac{-45}{145} \\\\\frac{20}{29}&\frac{21}{29}\\\end{array}\right][/tex]
Matrices are one of the most powerful tools in mathematics. The evolution of the concept of matrices is the result of an attempt to obtain compact and simple methods of solving the system of linear equations.
We have 2 by 2 matrix in the form,
[tex]\left[\begin{array}{ccc}9&9\\-9&-9\\\end{array}\right] X+\left[\begin{array}{ccc}6&3\\7&9\\\end{array}\right] =\left[\begin{array}{ccc}-1&8\\-4&6\\\end{array}\right] X\\\\Assume, X=\left[\begin{array}{ccc}a&b\\c&d\\\end{array}\right] \\\\[/tex]
After multiplication,
[tex]9a+9c+6=-a+8c\\\\-9a-9c+7=-4a+6c\\\\9b+9d+3=-b+8d\\\\-9b-9d+9=-4b-6d\\\\[/tex]
After solving the given system of equations
[tex]a=\frac{-97}{145}\\\\b=-\frac{54}{145}\\\\c=\frac{20}{29}\\\\d={21}{29}\\\\Hence, \\X=\left[\begin{array}{ccc}\frac{-97}{145}&\frac{-45}{145} \\\\\frac{20}{29}&\frac{21}{29}\\\end{array}\right][/tex]
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Lewis is a famous author only if he knows how to write. But Lewis is not a famousauthor. Hence, Lewis does not know how to write.1.If A, then B.2.Not A.So, 3.Not B.
The formula used to explain this statement is known as Modus Tollens, which is a form of logical inference.
Modus Tollens states that if the antecedent (A) of a conditional statement is false, then the consequent (B) must also be false. This is expressed mathematically as ¬A ⟹ ¬B. The formula used to explain this statement is known as Modus Tollens, which is a form of logical inference.
In this particular example, A is the statement that Lewis is a famous author, and B is the statement that Lewis knows how to write. Since the statement A is false, the statement B must also be false. This can be represented mathematically as:
¬A ⟹ ¬B
¬(Lewis is a famous author) ⟹ ¬(Lewis knows how to write)
False ⟹ False
Therefore, Lewis does not know how to write.
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You go to the grocery store and purchase the items listed in the table. What is your total if
the sales tax is 7%?
Answer:
where is the table?
Step-by-step explanation:
repost it with a picture of the table so we can answer it or tell the details and I'll answer in the comments?
A group of adult males has foot lengths with a mean of 28.02 cm and a standard deviation of 1.35 cm. Use the range rule of thumb for identifying significant values to identify the limits separating values that are significantly low or significantly high. Is the adult male foot length of 31.1 cm significantly low or significantly high? Explain.
The bounds of non-unusual measures are given as follows:
Lower bound: 25.32 cm.Upper bound: 30.72 cm.Hence an adult male foot length of 31.1 cm is significantly high, as it is greater than the upper bound.
What is the range rule of thumb?The range rule of thumb states that measures that are more than two standard deviations from the mean in a data-set are considered unusual.
Considering the mean and the standard deviation for this problem, the bounds are given as follows:
Lower bound: 28.02 - 2 x 1.35 = 25.32 cm.Upper bound: 28.02 + 2 x 1.35 = 30.72 cm.More can be learned about the range rule of thumb at https://brainly.com/question/15825971
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identify the correct unit fraction to multiply by the second term to create a common denominator for the rational expression below:
(2x^(2)-16)/(x^(2)-4)-(x 4)/(x-2)
The correct unit fraction to multiply by the second term to create a common denominator is [tex](x+2)/(x+2)[/tex]
To find a common denominator for the given rational expression, we need to identify a unit fraction that can multiply the second term so the denominators of both terms will be the same.
The denominators of the two terms are [tex]x^2-4[/tex] and [tex]x-2[/tex]. To find a common denominator for these terms, we can multiply the second term [tex](x+2)/(x+2)[/tex] which is a unit fraction because it is equal to 1.
Multiplying the second term by [tex](x+2)/(x+2)[/tex] gives us:
[tex](x 4)/(x-2) * (x+2)/(x+2) = (4x(x+2))/(x^2-4)[/tex]
Now both terms have a common denominator [tex]x^2-4[/tex]. Thus the correct unit fraction to multiply by the second term to create a common denominator is [tex](x+2)/(x+2)[/tex]
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suppose 83% of all students taking a beginning programming course fail to get their first program to run on first submission. consider a group of 7 such students,where each student's success is independent from the other and the chance each student fails on their first try is consistent. (round answers to three decimal places.)
The probability that all fail on their first submissions is 27.1%.
For each student, there are only two possible outcomes. Either their first program run will fail, or it wont. The probability of the first program run of a student failing is independent of the first program run of other students. So we use the binomial probability distribution to solve this question.
Binomial probability distribution
The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.
In which is the number of different combinations of x objects from a set of n elements, given by the following formula.
And p is the probability of X happening.
The expected value of the binomial distribution is
The variance of the binomial distribution is
The standard deviation of the binomial distribution is
In this question, we have that:
83% of all students taking a beginning programming course fail to get their first program to run on first submission. Sample of 7 students. This means that
All fail on their first submissions
So,
0.271 = 27.1% probability that all ail on their first submissions
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Para llegar desde un pueblo A hasta B existen 3 caminos, para llegar del pueblo B hasta el pueblo C hay 673 caminos distintos y para llegar desde el pueblo C hasta el pueblo D hay 2019 caminos, ¿Cuántos caminos distintos hay para llegar desde el pueblo A hasta el pueblo de pasando por los pueblos B y C?
⚘
what are you up for now and what time do you think you'll have time for
if there is sufficient evidence to reject the null hypothesis, we conclude that the alternate hypothesis is true
if there is not sufficient evidence to reject the null hypothesis, we conclude that the null hypothesis might be true, but we never conclude that the null hypothesis is true
If there is sufficient evidence to reject the null hypothesis, we conclude that the alternate hypothesis is true. if there is not sufficient evidence to reject the null hypothesis, we conclude that the null hypothesis might be true, but we never conclude that the null hypothesis is true
if there is not sufficient evidence to reject the null hypothesis, we conclude that the null hypothesis might be true, but we never conclude that the null hypothesis is true
This statement is describing the process of hypothesis testing in statistics. In hypothesis testing, a null hypothesis is a statement that there is no significant difference between two sets of data or no relationship between two variables. An alternate hypothesis is a statement that there is a significant difference or relationship.
When conducting a hypothesis test, a researcher will collect data and use statistical methods to determine the likelihood that the null hypothesis is true given the data. If the likelihood is low, the researcher will reject the null hypothesis and conclude that the alternate hypothesis is true. If the likelihood is high, the researcher will fail to reject the null hypothesis, but this does not necessarily mean that the null hypothesis is true. It means that the data is not strong enough to reject the null hypothesis.
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Triangle A C B is cut by line segment E D. Line segment E D goes from side B C to side A C. The length of B A is 4 x minus 6 and the length of E D is x + 2. The length of B E is x. Sides B E and E C are congruent. Sides A D and D C are congruent.
What is the length of BC?
From the markings on the diagram, we can tell E is the midpoint of BC and
D
is the midpoint of AC
We can apply the
theorem: ED = One-halfBA.
Substituting in the expressions for the lengths and solving for x, we get x =
.
Now, since BE = x, then BC =
.
The length of BC is 10.
What are similar triangles?When two triangles have some common corresponding properties, they are said to be similar. But they are no congruent.
In the given question, comparing triangles ABC and DEC. We have;
DE/ AB = EC/ BC
But,
BC = 2BE
= 2x
So that,
(x + 2)/ (4x - 6) = x/ 2x
(x + 2)/ (4x - 6) = 1/ 2
2(x + 2) = (4x - 6)
2x + 4 = 4x - 6
collect like terms
6 + 4 = 4x - 2
10 = 2x
x = 10/ 2
x = 5
Then,
BC = 2x
= 2*5
BC = 10
The length of BC is 10.
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How many integers greater than 5400 have both of the following properties :
a) the digits are distinct.
b) the digits 2 and 7 do not occur,
There are 94830 integers greater than 5400
At first, go it looks .like an infinite number but As digits are distinct
so a maximum 10 digits number is possible
but 2 & 7 can not be used so the maximum 8-digit number can be there
Total number = 4 digits numbers, 5 Digits numbers, 6 digits number, 7 digits numbers, 8 digits numbers
All the 5 - 8 digit numbers would be > 5400
Available number of Digits = 8 ( 0, 1, 3, 4, 5, 6, 8, 9)
for numbers greater than 4 digits (5 - 8 Digits), 1st digit can be 1, 3, 4, 5, 6, 8, 9 then from the 2nd digit onward 0 can also be a digit but the already used digit can not be used. and further one digit (already used) will keep reducing
5 Digits numbers = 7 * 7 * 6 * 5 * 4 = 5880
6 Digit Numbers = 7 * 7 * 6 * 5 * 4 *3 = 17640
7 Digits numbers = 7 * 7 * 6 * 5 * 4*2 = 35280
8 Digit Numbers = 7 * 7 * 6 * 5 * 4 *3*2*1 = 35280
Now in 4-digit numbers
Number starting with 6, 8, 9 > 5400 & number starting with 5
Number starting with 6 , 8 , 9 = 3 * 7 * 6 * 5 = 630
Number starting with 5, the second digit must be 4, 6, 8, 9
Number starting with 5 = 1 * 4* 6 * 5 = 120
Total integers greater than 5400
=5880 + 17640 + 35280 + 35280 + 630 + 120
= 94830
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Bethany runs 3 days a week four miles each day. How many miles does she run in 16 weeks?
Answer:
48 miles in 16 weeks dtWhat is the measurement of the angle shown below? O O 150° 60° ○ 30° 10 20 30 0 170 150 150 140 130 120 180° 249 848 60 90 100 110 120 130 140 150 80 70 60 50 $ ata
150°
Because it is not acute it cant be 30°
The average high temperature in degrees for a city are listed 58,61,71,77,91,100,105,102,95,82,66,57 if a value of 48 is added to the data how does the median change
If a value of 48 was added, the median of the data-set would remain decay from 79.5 to 77.
How to obtain the median of a data-set?The median of a data-set is the middle value of a data-set, the value of which 50% of the measures are less than and 50% of the measures are greater than.
The ordered data-set for this problem is given as follows:
57, 58, 61, 66, 71, 77, 82, 91, 95, 100, 102, 105.
The data-set has an even cardinality of 12, hence the median is the mean of the 6th and the 7th elements, as follows:
(77 + 82)/2 = 79.5.
A value of 48 would be lowest value of the data-set, the cardinality would be odd, and thus the middle value would be of 77.
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Find the area
…………………………
Answer:
118
Step-by-step explanation:
18*4=72
8+3*2=22
8*3=24
72+22+24=118
a ball suspended by a thread swings in a vertical plane so that its acceleration in the extreme position and lowest position are equal. The angle θ
of thread deflection in the extreme position will be:
(A) tan^−1(2)
(B) tan^−1(√2)
(C) tan^−1(1/2)
(D) 2tan^−1(1/2)
The angle θ of thread deflection in the extreme position is given by tan^−1(2).
The angle of thread deflection in the extreme position can be calculated by using the equation of motion of a simple pendulum.
The equation of motion for a simple pendulum is given by m g L sinθ = m a. Here, m is the mass of the ball, g is the gravitational acceleration, L is the length of the thread and θ is the angle of the thread.
From the given condition, the acceleration of the ball in the extreme and lowest positions are equal. This implies that the acceleration of the ball in the extreme position is equal to the acceleration due to gravity.
Therefore, the equation of motion reduces to g L sinθ = g. Solving for θ, we get sinθ = 1, which implies that θ = tan^−1(2).
Therefore, the angle θ of thread deflection in the extreme position is given by tan^−1(2).
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What is the area of ΔABC such that b = 28 cm, c = 14 cm, and m∠A = 30°? Round the answer to three decimal places.
The area of the ΔABC is 98 cm²
How to find the area of ΔABC?In a triangle, we can use the sine formula to find the area of the triangle when we know one angle and the two side lengths opposite and adjacent to that angle.
Area of ΔABC = (1/2) bc sinA
Substitute b = 28 cm, c = 14 cm, and m∠A = 30° into the formula:
Area of ΔABC = (1/2) × 28cm × 14cm × sin 30°
Area of ΔABC = 98 cm²
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