Question

Circle c has a radius of 10 cm. Each of points B and D is on the midpoint of the radius. Find the shaded area.

Answer 1

Firstly you have to realize that the shaded area is one fourth of the the area of the whole circle !

Answer 2

\[area =\Pi r ^{2}\]
This is the general equation
Since the shaded part is one forth of it
\[Area = \frac{ \Pi r ^{2} }{ 4 }\]