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Find the Volume of a Right Circular Cone With: Height 21 Cm and Slant Height 28 Cm. - CBSE Class 9 - Mathematics

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Question

Find the volume of a right circular cone with: 

height 21 cm and slant height 28 cm. 

Solution

From the relation 

`l^2=r^2+h^2,`we have  

`r=sqrt(l^2-h^2)=sqrt((28)^2)-(21)^2=7sqrt7cm`  

So, volume of cone =`1/3xxpir^2xxh` 

`=1/3xx22/7xx(21)^2xx(7sqrt7)^2` 

`=7546cm^3`

  Is there an error in this question or solution?

APPEARS IN

 RD Sharma Solution for Mathematics for Class 9 by R D Sharma (2018-19 Session) (2018 to Current)
Chapter 20: Surface Areas and Volume of A Right Circular Cone
Ex.20.20 | Q: 1.3 | Page no. 20
Solution Find the Volume of a Right Circular Cone With: Height 21 Cm and Slant Height 28 Cm. Concept: Surface Area of a Right Circular Cone.
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