Question

if the circumference of circle is 22 cm, find the area of the semicrcle​

Answer 1

Solution :-

Given - Circumference of circle = 22 cm

Let the radius of the given circle be 'r'

Circumference of a circle = 2πr

⇒ 22 = 2 × 22/7 × r

⇒ r = (22 × 7)/(22 × 2)

⇒ r = 154/44

⇒ r = 3.5 cm

Area of circle = πr²

⇒ 22/7 × 3.5 × 3.5

⇒ 269.5/7

= 38.5 cm²

So, the area of the given circle is 38.5 cm².

Answer 2

circumference=2πr=2×22/7 r=22

r=7/2

Area = π r^2

=22/7×49/4=11/2×7=77/2= 38.5cm^2