RD Sharma - Mathematics

Book: RD Sharma - Mathematics

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

Subject: Mathematics - Class 9th

Q. No. 19 of Exercise 20.1

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A circus tent is cylindrical to a height of 3 metres and conical above it. If its diameter is 105 m and the slant height of the conical portion is 53 m, calculate the length of the canvas 5 m wide to make the required tent.

For cylindrical part, we have

Height( h) = 3 m

Radius (r) = m

Total curved surface area = 2πrh+2πrl

= πr(2h+l) = ×× (6+53) m2= 11×15×59 m2

Hence, length of 5 m wide canvas = m = 1947 m

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