Question
Find the cost of canvas 1.75 m wide at Rs. 50 per metre
required to build a conical tent of base radius 21 cm and height 28 cm.Solution
Here, r = 21 cm and h = 28 cm Slant height, l = 35m Area of the tent =Area of canvas = 
rl = ( X 21 X 35)m² = 2310m² ∴ Length of canvas= = = 1320 m. ∴ Cost of canvas= 1,320 x 50 = Rs. 66,000
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