Q.7 Find the perimeter of the adjoining figure, which is a semicircle including its diameter.

Given: Diameter = 10 cm
Then r = 5 cm
Perimeter of the adjoining figure = \( \frac{2 \pi r}{2} + 2r = \pi r + 2r \)
\(= \frac{22}{7} × 5 + 2×5 = \frac{110}{7} + 10 = \frac{180}{7} cm \) = 25.71 cm