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30 April, 16:10

What is the area of a semicircle with a diameter of 21.5

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  1. 30 April, 16:20
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    Area of a circle = PI x R^2

    r = 1/2 diameter

    r = 21.5/2

    r = 10.75

    Area of circle = 3.14 x 10.75^2 = 3.14 x 115.5625 = 362.86625 square units.

    A semicircle is half a circle:

    Area of semicircle = 362.86625 / 2 = 181.433125 square units (round the answer as needed).
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