Question

Find the radius of semi circle where AC=8cm,BC=6cm

Answer 1

Circumference of semi-circle = $d + \frac{\pi \: d}{2}$

Length of boundary of shaded portion= $8 + \frac{\pi \: (8)}{2} + 4 + \frac{\pi \: 4}{2} + 2 + \frac{\pi \:2 }{2}$

$= 14 + 7\pi$

$= 14 + 7 \times \frac{22}{7}$

$= 36 \: cm$