If the perimeter of a semi-circular park is 72 m. Find its radius and area.
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Answer: perimeter of semi circle = πr + 2r
∴ 72 m = 3.14 × r + 2r
∴ 3r = 22.9
∴ r = 7.63
area of semi-circle = πr² / 2
= 3.14 × 7.63 × 7.63/ 2
= 182.8
= 91.4 m²
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