Question

The circumference of a circle is 22cm . Find its area?And also find the area of the semicircle.

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

Answer 2

Circumference of circle=22cm

Area of circumference =2pi r =22 ,2×22/7×r=22 , 2/7×r=0 r=7/2=3.5 area of circle =pi r^2 22/7×3.5×3.5=38.5 area of semicircle =area of circle /2 =38.5/2 =19.25