Which of the following expressions correctly shows the relationship between the circumference and the area of a circle?(1 point)

Question

Responses

Cd=π
Start Fraction upper C over d End Fraction equals pi

C2=4πA
upper C squared equals 4 pi upper A

A=πr2
upper A equals pi r squared

C=2πr

Answer 1

C=2πr

Answer 2

If C=12π , what is the area of the circle? (1 point)
Responses

144π
144 pi

36π
36 pi

12π
12 pi

24π

Answer 3

If C=12π, we use the formula: C = 2πr, where r is the radius of the circle. Given C = 12π, we can solve for r:
12π = 2πr
r = 6 units

Then, we calculate the area using the formula A = πr^2:
A = π(6)^2
A = 36π

Therefore, the area of the circle would be 36π. So the correct answer is: 36π.

Answer 4

Which formula is used to find the area of a circle when given the radius?(1 point)
Responses

A=d2
upper A equals d squared

A=r
upper A equals r

A=2r
upper A equals 2 r

A=r2

Answer 5

A=r²

Answer 6

Which formula is used to find the circumference of a circle when the radius is given?(1 point)
Responses

C=2d
upper C equals 2 d

C=2r
upper C equals 2 r

C=r2
upper C equals r squared

C=r

Answer 7

C=2πr