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The area of a semicircle is 308 cm2. Calculate its perimeter (in cm). 1). 1442). 493). 984). 72 |
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Answer» Formula for Area of a semicircle = πr2/2 Given πr2/2 = 308 ⇒ (22/7) × R2 = 308 × 2 ⇒ r2 = 308 × 2 × (7/22) = 14 × 14 ⇒ r = √(14 × 14) = 14 cm Diameter (d) = 2 × 14 = 28 cm PERIMETER of semicircle = [(1/2) πd] + d = [(1/2) × (22/7) × 28] + 28 = 44 + 28 = 72 ∴ Required Perimeter = 72 cm |
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