find the perimeter and area of a semicircle whose diameter is 10 cm
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radius = 1/2(diameter) = 5 cm
perimeter of semicircle,
= 1/2(circumference of circle)
=1/2(2πr)
= 110/7 = 15.71 cm
area of semicircle = 1/2(area of circle)
= 1/2 ×(22/7)× 5²
=39.28 cm²
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