Question

How do you find the area of a Semicircle circle of a Composite Figure?

Answer 1

well, is not a semi-circle, is half of a semi-circle or a semi semi-circle, or namely just one-quarter of a circle, Check the picture below.

`stackrel{ \textit{\LARGE Areas} }{\stackrel{ \textit{quarter of a circle} }{\cfrac{1}{4}\cdot \pi (4)^2}~~ + ~~\stackrel{ rectangle }{(4)(5)}}\implies 4\pi +20 ~~ \approx ~~ \text{\LARGE 32.57}`