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1 October, 18:53

If the perimeter of the semicircle is 10.28mm. What is the semicircles radius?

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  1. 1 October, 19:19
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    The formula for a circle's circumference (circle's unique perimeter) is pi * diameter.

    However, since we have a semicircle (half of the circle), our formula would 1/2 * pi * diameter, or just pi * radius.

    Set up an equation and solve.

    10.28 = pi * radius.

    r = (10.28) / pi
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