# NCERT Class 9 Solutions: Surface Areas and Volumes (Chapter 13) Exercise 13.4 – Part 1

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Q-1 . Find the surface area of a sphere of radius:

Solution:

1. Radius of the sphere (r)

Surface area

• Radius of the sphere (r) , Surface area

• Radius of the sphere (r) , Surface area

Q-2 Find the surface area of a sphere of diameter:

Solution:

1. (), Surface area

2. (), Surface area

3. 2

4. (), Surface area