RD Sharma - Mathematics

Book: RD Sharma - Mathematics

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

Subject: Mathematics - Class 9th

Q. No. 3 of Exercise 20.2

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Two cones have their heights in the ratio 1 : 3 and the radii of their bases in the ratio 3 : 1. Find the ratio of their volumes.

Let the heights of the cones be h and 3h units and the radii of their bases be 3r and r respectively. Then, their volumes are

V1= π(3r)2×h and V2= π×r2×3h


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