RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 20. Surface Area and Volume of a Right Circular Cone

Subject: Mathematics - Class 9th

Q. No. 11 of Exercise 20.1

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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

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