find the perimeter and area of a semicircle whose diameter is 5.6 CM
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D = 5.6 => r = 2.8 cm
Perimeter = πr = 22/7 × 2.8 = 8.8 cm
Area = 1/2 πr² = 1/2×22/7×2.8 = 4.4 cm²
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