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Semicircle:
Area = (Pi * Radius2) / 2
Total Perimeter = (Pi * Radius) + (2 * Radius) A2 The equation is the same as a full circle but the values of the dependent variable are restricted to be either only positive or only negative. For example y = ( R^2 - x^2 )^1/2 with only y > 0 or = 0 allowed. And of course x^2 can never be greater then R^2 in either a full circle or semi circle.
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