Question

find the area of semicircle whose radius is 10cm

Answer 1

area of semi circle= 1/2πr^2= (1/2)3.14(10)^2@= 157cm2

Answer 2

$area \: of \: semicircle = \frac{\pi {r}^{2} }{2} \\ given \: r = 10cm \\ area \: of \: semicircle = \frac{\pi {10}^{2} }{2} = 50\pi \\ = \frac{440}{7} = 62.8 {cm}^{2}$
Therefore the area of semicircle is 62.8cm^2.