ICSE Board Question Based on Mensuration Chapter of M.L Aggarwal for class10
In this question you have to find the surface area of a sphere whose radius is given.
This is the Question Number 01, Exercise 17.3 of M.L Aggarwal.
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Find the surface area of a sphere of radius : (i) 14 cm (ii) 10.5 cm
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(i) Given radius of the sphere, r = 14 cm
Surface area of the sphere = 4r2
= 4×(22/7)×142
= 4×22×14×2
= 2464 cm3
Hence the surface area of the sphere is 2464 cm2.
(ii) Given radius of the sphere, r = 10.5 cm
Surface area of the sphere = 4r2
= 4×(22/7)×10.52
= 1386 cm3
Hence the surface area of the sphere is 1386 cm2.