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# Solution for A Cone and a Hemisphere Have Equal Bases and Equal Volumes. Find the Ratio of Their Heights. - CBSE Class 9 - Mathematics

ConceptVolume of a Sphere

#### Question

A cone and a hemisphere have equal bases and equal volumes. Find the ratio of their heights.

#### Solution 1

Given that
A cone and a hemisphere have equal bases and volumes

V_"cone"   = V _"hemisphere"

⇒ 1/3πr^2h=2/3πr^3

⇒r^2h=2r^3

⇒h=2r

⇒h:r -2r:r-2:1

#### Solution 2

Given that
Volume of thee cone = Volume of the hemisphere

⇒1/3πr^2h=2/3πr^3

⇒r^2h=2r^3

⇒h=2R

⇒h/r=1/1×2=2/1

∴ Ratio of the their height is 2 :1

Is there an error in this question or solution?

#### APPEARS IN

R.D. Sharma Mathematics for Class 9 by R D Sharma (2018-19 Session) (with solutions)
Chapter 18: Surface Areas and Volume of a Cuboid and Cube
Q: 24
Solution for question: A Cone and a Hemisphere Have Equal Bases and Equal Volumes. Find the Ratio of Their Heights. concept: Volume of a Sphere. For the course CBSE
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