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 13.8
Page No:236
Questions No:1
Find the volume of a sphere whose radius is (i) 7 cm (ii) 0.63 m
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Radius of sphere r = 7 cm
Therefore, volume of sphere = 4/3πr³
= 4/3 × 22/7 × 7 × 7 × 7 = 4/3 × 22 × 7 × 7 = 1437(1/3) cm³
Hence, the volume of sphere = 4/3πr³
= 4/3 × 22/7 × 0.63 × 0.63 × 0.63 = 4 × 22 × 0.03 × 0.63 × 0.63 = 1.05 m³(approx.)
Hence, the volume of sphere is 1.05 m³.