Question

find the area of shaded side

Answer 1

Area of shaded portion=Area of ∆ ABC - 3 sectors area.

=
$\frac{ \sqrt{3} }{4} {10}^{2} - 3( \frac{1}{2} ({5)}^{2} ) \frac{\pi}{3}$

$25 \sqrt{3} - \frac{25\pi}{2}$
hope it will help you.