Question

What is the exact circumference of the circle?

Answer 1

Hello!

What is the exact circumference of the circle?

A.

10π feet  

B.

20π feet  

C.

40π feet  

D.

60π feet

Solving: Using the data  (Circle with center A and diameter of 20 feet labeled).

diameter = 2*radius

$20 = 2*r$

$2\:r = 20$

$r = \dfrac{20}{2}$  

$\boxed{r = 10\:ft}$

Formula: (Circle length)

$\boxed{C = 2* \pi *r}$

Now, replace in the circumference length formula:

$C = 2\:\pi *r$

$C = 2\:\pi *10$

$\boxed{\boxed{C = 20\:\pi\:ft}}\end{array}}\qquad\quad\checkmark$

Answer:  

B.  20π feet

$\underline{The\:exact\:circumference\:of\:the\:circle\:is\:\:20\:\pi\:ft}$

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I Hope this helps, greetings ... Dexteright02! =)