Question

Find the perimeter and area of a semicircle of radius 28 cm.

Answer 1

Given, $r=28cm$
Perimeter $=(\pi +2)r=(\frac{22}{7}+2)28=144cm$
Area $=\frac{\pi r^2}{2}=\frac{22}{7}\times \frac{28\times 28}{2}=1232c{m}^2$