Question

Find the radius of a semi circle when it’s area is 77cm2

Answer 1

Answer:7cm

Step-by-step explanation:

For finding the radius ;

Area of semicircle = πr^2/2 = 77cm^2

Now ,

πr^2/2 = 77

r^2 = 77 ×2/π

r^2 = 77 × 2 ×7/22

r^2 = 7× 7

r^2 = 49

r = 7 cm --(Taking square root)