Question

find the circumferance of a circle whose area is 100m.

please help :) thanks so much

Answer 1

C = 2pi r

A = pi r^2

100/pi = r^2

C = 2pi(sqrt(100/pi))

Answer 2

20pi
------ looks wierd lol
sqrt(pi)

Answer 3

its abt 35.5

Answer 4

its radius is 10 over square root of pi.

so its circumference is 2pir
2pi(10/square root of pi)
= 35.45

Answer 5

pi r^2 = area of circle.
pi r^2 = 100
Solve for r above.\[r=\frac{10}{\sqrt{\pi }} \]\[c=\pi\text{ 2 r}=\pi\text{ 2}\left(\frac{10}{\sqrt{\pi }}\right)=20 \sqrt{\pi } \]