A Joker’s cap is in the form of a right circular cone of base radius 7 cm and height 24 cm. Find the area of the sheet required to make 10 such caps.

We have,

Based radius of conical cap =r = 7cm

Vertical height = h = 24 cm

slant height = l === 25 cm

Required area of sheet =

= 10×πrl=10××7×25 cm2=5500 cm2