# What is the lenght of canvas cloth which is 3 meters wide is used to makea conical tent 10 meters in diameter and 4.2 meters slant height?Find the cost of the canvas cloth at the rate of 2.50 per meter

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slant height,l= 4.2 m

area of curved surface =π× r× l

=22/7×5×4.2

on solving , we get,

area= 66 m²

length of the canvas cloth =66/3

=22 m

now, cost = 22×2.50

=Rs 55