How to work out the perimeter of a semicircle

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How to work out the perimeter of a semicircle

Hi Lisa, the perimeter of a circle is ? ?,? ?-D where D is the diameter so half of that is, 1/2 ? ?,? ?-d. But if you're going to walk around a semicircle you have to go to halfway around the circle and then through a diagonal to return to where you started so the perimeter is 1/2 ? ?,? ?- d + d. Penny The closed line continues that makes the boundary of a two-dimensional shape is known as a perimeter. It is easy to process the perimeter of a shape with straight edges, like a square, because it simply add the lengths of each board together. A different formula is necessary to process the perimeter of a semicircle (a half-cut circle), because it consists of a curved border and a straight edge. That formula is p = frac {1} {2} ? ?,? D + D where ? ? ?,?

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