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
11