Question

A tent is of the shape of cylinder upto height of 3m and then becomes cone with the maximum height 13.5m. Calculate the maximum cost of painting the inner side of the tent at the rate of rupees 2 per meter square, if the radius is 14m.

Answer 1

CONE

CSA=πrl, h=13.5, r = 14

I=v14^2+13.5^2 =v378.45 = I9.45m

πrl=22x14x19.45/7 =855.8m2

cost of painting @ Rs2

=855.8x2 = Rs 1711.60