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The area of a semicircle is 308 cm2. Calculate its perimeter (in cm). 1). 1442). 493). 984). 72

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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