A joker cap is in the form of a right circular cone of radius 7 cm. If l =25 cm, find the area of the sheet required for 12 such caps.
Given that a joker cap is in the form of a right circular cone.
Radius of the cone is, r=7 cmand slant height, l=25 cm
to find out: Area of the sheet required for 12 caps.
We know that, surface area of a cone =2πrl
∴ area of one cap =2×227×7×25=1100 cm2
Hence, area of the sheet required for 12 such caps =12×1100=13200 cm2.