Question

Find the area of a circle with a circumference of 20tt units. *

ANSWER ASAP!!!

A.100 units squared
B.400 units squared
C.314 units squared
D.200 units squared

Answer 1

`= 31.76 {units}^(2)`

*this is the correct answer but the correct answer is not there.

Explanation:

`2\pi \: r = 20 \\ (2\pi \: r)/(2) = (20)/(2) \\ \pi \: r = 10 \\ (\pi \: r)/(\pi) = (10)/(\pi) \\ r = 3.18 \: \: units`

`area = \pi {r}^(2) \\ = \pi * 3.18 * 3.18 \\ = 31.76 {units}^(2)`