# NCERT Class 9 Solutions: Surface Areas and Volumes (Chapter 13) Exercise 13.8 – Part 1

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Q-1 Find the volume of a sphere whose radius is

Solution:

Radius of the sphere

So, Volume of the sphere

=

=

=

^{=}Radius of the sphere

Volume of the sphere

=

=

=

Q-2 Find the amount of water displaced by a solid spherical ball of diameter.

Solution:

Spherical ball’s diameter is

Radius

Amount of water displaced by the spherical ball = Volume of the ball

=

=

=

=

The spherical ball’s diameter

Radius

Amount of water displaced by the spherical ball = Volume of the ball

=

=

=

Q-3 The diameter of a metallic ball is. What is the mass of the ball, if the density of the metal is?

Solution:

Diameter of the ball

Radius

Volume of the ball

=

=

=

Density of the metal is

Therefore, mass of the ball