Question
Find the perimeter of a sector which forms a central
angle of 120Β° in a circle of radius 21 cm. (Use Ο = 22/7)Solution
Arc length = (ΞΈ / 360) Γ 2Οr = (120 / 360) Γ 2 Γ (22 / 7) Γ 21 = (1 / 3) Γ 132 = 44 cm Perimeter of sector = Arc length + 2 Γ Radius = 44 + 2 Γ 21 = 44 + 42 = 86 cm
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