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first we find the circumference which is 2 pi r.then we divide it with half because we want half of circumference,my ans is 72 cm. peri meter is circumference divided by 2 then add diameter in ans

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13y ago

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Multiply its diameter by (pi), or its radius by (2 pi).

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14y ago
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Anonymous

4y ago
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Q: How you find the perimeter of semi circle if diameter is 28 cm?
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