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](/tpl/images/0184/9745/563a6.png)
![2\:r = 20](/tpl/images/0184/9745/9e645.png)
![\boxed{r = 10\:ft}](/tpl/images/0184/9745/d5943.png)
Formula: (Circle length)
![\boxed{C = 2* \pi *r}](/tpl/images/0184/9745/269bd.png)
Now, replace in the circumference length formula:
![C = 2\:\pi *r](/tpl/images/0184/9745/7d318.png)
![C = 2\:\pi *10](/tpl/images/0184/9745/976ca.png)
![\boxed{\boxed{C = 20\:\pi\:ft}}\end{array}}\qquad\quad\checkmark](/tpl/images/0184/9745/6a753.png)
B. 20π feet
![\underline{The\:exact\:circumference\:of\:the\:circle\:is\:\:20\:\pi\:ft}](/tpl/images/0184/9745/7f5cf.png)
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I Hope this helps, greetings ... Dexteright02! =)