Math CentralQuandaries & Queries


Question from Rebecca, a student:

how do you find the area of a semi circle and then how do you add the area of a semi circle and the area of a rectangle?

Hi Rebecca,

The area of a circle is $\pi$ times the diameter where $\pi$ is approximately 3.1416. A semicircle is half a circle so the area of a semicircle is $\large \frac12 \times \pi$ times the diameter.

The two areas, that of the semicircle and the rectangle, are numbers so to add the areas just add the numbers.

I hope this helps,

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