Math CentralQuandaries & Queries


Question from Heather, a parent:

We need the formula for area of half circle please explain where each number comes from.

Thank you Heather

Hi Heather,

The area if a circle is given by π r2 where π is approximately 3.1416 and r is the radius of the circle. The arrea of half a circle will be half of π r2 .


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