Question

find the area of shaded region

Answer 1

radius = 21/2=10.5m
area of circle=πr²
= 22/7×10.5×10.5
=22×1.5×10.5
= 346.50m²
radius of semicircle=10.5/2=5.25m
area of semicircle=πr²/2
=(22/7×5.25×5.25)÷2
=(22×0.75×5.25)÷2
=(86.6250)÷2
=43.3125m²
this area of two semicircle=2×43.3125
=86.6250m²
hence,area of shaded part = 346.50m²- 86.6250=259.8750