Perimeter of a Semi Circle?

The perimeter of a semicircle is made up of two parts, a diameter and a curved piece which has the length of half the circumference of the circle. Suppose the diameter is d units then the circumference is πd units long. Thus the perimeter of the semicircle is d+πd/2 units long.
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To find the perimeter of a semi circle, all you need to do is find the perimeter of the entire circle and divide it by two. So use pi*r squared and divide it ...
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