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Solution for The Area of the Curved Surface of a Cone is 60 Cm2. If the Slant Height of the Cone Be 8 Cm, Find the Radius of the Base? - CBSE Class 9 - Mathematics

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Question

The area of the curved surface of a cone is 60 cm2. If the slant height of the cone be 8 cm, find the radius of the base? 

Solution

Given that  

Curved surface area of cone =` 60picm^2` 

∴ Slant height of cone (l) = 8cm 

i.e , `pirl=60pi` 

⇒ `pixxrxx8=60pi`

⇒` r=60/8=7.5` 

∴ Radius of cone = 7.5cm 

  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
Q: 8 | Page no. 7
Solution The Area of the Curved Surface of a Cone is 60 Cm2. If the Slant Height of the Cone Be 8 Cm, Find the Radius of the Base? Concept: Surface Area of a Right Circular Cone.
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