Question

A jokers cap us in the form of right circular cone of base radius 7cm and height 24cm find the area of sheet required to make such 10 caps

Answer 1

Given,

Radius of cap, r = 7 cm

Height of cap, h = 24 cm

By pythagoreas theorem, we have

l2 = r2 + h2 = 72 + 242 = 49 + 576 = 625

So, l = root(625) = 25 cm

Area required to make one cap = C.S.A. of cone

= TTrl

= 22/7*7*25

= 550 cm2

Area required to make 10 such caps = 10*550 = 5500 cm2 = 0.55 m2

Hope it helps

Answer 2

find the length 

then find the area of the cone  - 

then multiply it