Question

Find what length of canvas,1•5m in width,is required to make a conical tent 48m in diameter and 7m in height.Given that 10% of the canvas is used in folds and stitching.Also,find the cost of the canvas at the rate of Rs24 per metre.

Answer 1

curved surface area of cone=πrl
l=√h2+r2
√7*7+24*24
√49+576
√625
25
so now,
let's find our curved surface area=22/7*24*25
1885.71
now as we know that length *width =curved surface area
length*1. 5=1885.71
length=1885.71/1.5
1257.14
also it is given that 10%is used in stitching so we have to add that
10/100*1257.14
125.71
so now length =1257.14+125.71=1382.85