Question
Find the length of canvas 1.25 m wide required to build a conical tent of base radius 7 metres and height 24 metres.
Find the length of canvas 1.25 m wide required to build a conical tent of base radius 7 metres and height 24 metres.
Answer: Option A
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Here, r = 7m and h = 24 m
l = (r2 + h2)(1/2) = (72 + 242)(1/2) = (625)(1/2) = 25 m
Area of canvas = 22/7*rl = ((22/7)*7*25) m2 = 550 m2
Length of canvas = (Area/Width) = (550/1.25) m = 440 m.
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