Question
Find the perimeter of a sector which forms a central
angle of 72° in a circle of radius 35 cm . (Use π = 22/7)Solution
Arc length = (θ / 360) × 2πr = (72 / 360) × 2 × (22 / 7) × 35 = (1 / 5) × 220 = 44 cm Perimeter of sector = Arc length + 2 × Radius = 44 + 2 × 35 = 44 + 70 = 114 cm
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