RD Sharma - Mathematics

Book: RD Sharma - Mathematics

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

Subject: Mathematics - Class 9th

Q. No. 8 of Exercise 20.1

Listen NCERT Audio Books to boost your productivity and retention power by 2X.


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

We have,

Curved surface area of cone = 60π cm2

Slant height l = 8 cm

So , πrl = 60π

rl = 60

= r ==7.5 cm

Chapter Exercises

More Exercise Questions