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A Right Angled Triangle of Which the Sides Containing He Right Angle Are 6.3 Cm and Lo Cm In Length, is Made to Turn Round on the Longer Side. Find the Volume of the Solid, Thus Generate - CBSE Class 9 - Mathematics

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Question

A right angled triangle of which the sides containing he right angle are 6.3 cm and lo cm in length, is made to turn round on the longer side. Find the volume of the solid, thus generated. Also, find its curved surface area. 

Solution

Given, radius of cone (r) = 6.3cm 

Height of cone (h) =10 cm 

∴ WKT, Slant height l = `sqrt((6.3)^2+(10)^2)` 

=` 11.819 cm [l=sqrt(r^2+h^2)]` 

∴ Volume of cone = `1/3pir^2h=1/3xx3.14xx(6.3)^2xx10=4158cm^3`

And CSA of cone=`pirl` 

= `22/7xx6.3xx11.819=234.01cm^2`                                                         

  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: 11 | Page no. 21
Solution A Right Angled Triangle of Which the Sides Containing He Right Angle Are 6.3 Cm and Lo Cm In Length, is Made to Turn Round on the Longer Side. Find the Volume of the Solid, Thus Generate Concept: Surface Area of a Right Circular Cone.
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