Math CentralQuandaries & Queries


Question from sagir, a student:

how to find the area of semi circle?


You need to know the area of a circle. The expression is

area = π r2 where r is the radius of the circle and π is approximately 3.1416.

A semicircle is half a circle so the area of a semicircle of radius r is half the area of a circle of radius r.


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