Question
A wooden toy is in the form of a sphere with diameter 28
cm. Find the cost of polishing its surface at the rate of 50 paise per cm². (Take π = 22/7)Solution
Given: Diameter = 28 cm → Radius = 14 cm π = 22/7 Rate = ₹0.50 per cm² Formula: Surface area of sphere = 4 × π × r² Calculation: = 4 × (22/7) × 14 × 14 = 2464 cm² Cost: = 2464 × 0.50 = ₹1232
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