Question

Find the radius and circumference of a circle whose area is 144π cm2 .

Answer 1

area of the square =
$144\pi {cm}^{2}$
$\pi {r }^{2} = 144\pi$


${r }^{2} = 144$

$r = 144 \: cm$

now
$2\pi \: r = 2 \times 22 \div 7 \times 12 = 528 \div 7 = 75.42$