Question

What is the perimeter of semicircle haveing perimeter 22 cm

Answer 1

2πr=22

2×22/7×r=22

r=22×7/2×22

7/2 =3.5

now area =πr^2

22/7×3.5×3.5

38.5cm^2

area of semi circle= area of circle /2= 19.25