Question

The area of the circle above is 1,962.5 units2. What is the circumference of the circle? Use = 3.14.

Answer 1

Formula for area:
$\pi r^{2}$
Formula for circumference 
$2 \pi r$

1,962.5 /$\pi$ = 625
Now we find the cube root of 625 (because $r^{2}$ is r x r)
25 x 25 = 625
25 is radius
$2 (25^{2})\pi$
50  x pi = $157 cm^{2}$