Question

Find the circumference of a circle whose area is /. A. B. C. D.

Answer 1

I just took the test and the correct answer that i got was B

Answer 2

You missed to write the value of the area of circle so just for explanation purpose, I will assume that given area is $25 \pi$

Now question says to find the circumference. To find circumference we first need to find the radius (r)

Hence plug the value of area into formula of the area of circle and find the radius.

$Area=\pi r^2$

$25 \pi=\pi r^2$

divide both side by pi

$25 =r^2$

take square root of both sides

5=r

now we can plug value or radius r=5 into formula of circumference of the circle.

$circumference = 2 \pi r$

$circumference = 2 \pi *5$

$circumference = 10 \pi$

Hence final answer is $circumference = 10 \pi$.

You can repeat same procedure with given value of area to find correct answer.