This is the Important question of class 10 Based on Mensuration Chapter of M.L Aggarwal book for ICSE BOARD.
In this question you have to Find the surface area of a sphere for which its diameter is given.
This is the Question Number 03, Exercise 17.3 of M.L Aggarwal.
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Find the surface area of a sphere of diameter: (i) 21 cm (ii) 3.5 cm
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(i) Given diameter of the sphere, d = 21 cm
Radius, r = d/2 = 21/2 = 10.5
Surface area of the sphere = 4r2
= 4×(22/7)×10.52
= 1386 cm2
Hence the surface area of the sphere is 1386 cm2.
(ii) Given diameter of the sphere, d = 3.5 cm
Radius, r = d/2 = 3.5/2 = 1.75
Surface area of the sphere = 4r2
= 4×(22/7)×1.752
= 38.5 cm2
Hence the surface area of the sphere is 38.5 cm2.