NCERT Solutions for Class 9 Maths Chapter 13
Important NCERT Questions
Surface Areas and Volumes
NCERT Books for Session 2022-2023
CBSE Board, UP Board and Other state Boards
EXERCISE 13.4
Page No:225
Questions No:2 Part:3
Find the surface area of a sphere of diameter: 3.5 m.
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Radius of sphere r = 3.5/2 = 1.75 cm
Surface area of sphere = 4πr²
= 4 × 22/7 × 1.75 × 1.75 = 4 × 22 × 0.25 × 1.75
= 38.50 cm²
Hence, the surface area of sphere is 38.5 cm².