Question

find the perimeter of a semicircle of radius 7 cm

Answer 1

given,radius,r=7cm
circumference of a semicircle
$2\pi \: radius \frac{1}{2}$

therefore circumference of semicircle=
$= 2 \times \frac{22}{7} \times \frac{1}{2} \times 7$
$= 22cm$
therefore perimeter of the semicircle=22+2r
=22+2*7
=22+14
=36 cm
Hence,the perimeter of the semicircle is 36cm
hope it helps you