Question

Find the area of shaded region.

Answer 1

The diameter of semicircles is side of square $2a$

$⟹a+2a+a=42a=\frac{42}{4}=10.5cm$

Area of square is $(2a{)}^2={21}^2=441c{m}^2$

Area of semicircles is $4\times \frac{\pi r^2}{2}2\times \frac{22}{7}\times 10.5\times 10.544\times 1.5\times 10.5=693c{m}^2$