Question
A conical cap has base diameter 126 cm and height 16 cm.
What is the cost of painting the surface of the cap at the rate of 20 paisa per cm² ? (Take π = 22/7.)Solution
Given: Diameter = 126 cm ⇒ Radius = 63 cm, Height = 16 cm, π = 22/7, painting rate = 20 paisa/cm². Slant height, l = √(632 + 162) = 65 cm Curved Surface Area (CSA) = πrl = (22/7) × 63 × 65 = 12884.29 sq.cm Cost = 12884.29 × 0.20 = 2576.86 paisa = ₹ 25.77
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