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.
Answer: Option D
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Here , r = 7 m and h = 24 m
so, l = `sqrt(r^2+ h^2) = sqrt(7^2 + 24^2) = sqrt(625) = 25 m`
Area of canvas = ` pi rl = (22/7 xx 7 xx 25) m^2 = 550 m^2`
`:.` Length of canvas = `((Area)/(Width)) = ( 550/1.25)` m = 440 m.
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