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What is the best approximation for the perimeter of a semicircle with a diameter of 12 cm? use 3. 14 to approximate pi.
in order to find the perimeter you multiply 2 by pi (3.14) then multiply that answer by the radius which is 6. Then divide that answer by 2 since the shape is a semi circle then add the diameter (12) to that answer and you get 30.84.
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