Question

The base radius and total surface area of a solid cone are 9cm and 720cm^2 respectively, Find the volume of cone.

Answer 1

Answer:

Given, r=20,l=29

We know, h=l2−r2

=292−202

=841−400

=441=21

Volume of cone =31πr2h cubic unit

=31×722×20×20×21

=8800 sq.cm.