Question

Find the perimeter and area of a semicircle whose radius is 14 cm.

Answer 1

Radius of a semicircle, $r=14cm$
Perimeter of a semicircle, $P=(\pi +2)r$ units
$\therefore P=(\frac{22}{7}+2)\times 14$
$=\left(\frac{22+14}{7}\right)\times 14=\frac{36}{7}\times 14=72$
Perimeter of the semicircle = 72 cm.
Area of a semicircle, $A=\frac{\pi r^2}{2}$ sq. units
$\therefore A=\frac{22}{7}\times \frac{14\times 14}{2}=308c{m}^2$.