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:2
Find the surface area of a sphere of diameter: 21 cm.
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Radius of sphere r = 21/2 = 10.5 cm
Surface area of sphere = 4πr²
= 4 × 22/7 × 10.5 × 10.5 = 4 × 22 × 4.5 × 10.5 = 1386 cm²
Hence, the surface area of sphere is 1386 cm².
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