9th mathematics NCERT exercise questions with answers, Mathematics

Surface Area and Volumes – Exercise 13.8 – Class IX

Assume π = 22/7 , unless stated otherwise. Find the volume of a sphere whose radius is (i) 7 cm (ii) 0.63 m Solution: (i) Volume of sphere = 4/3 πr3 = 22/7 x 4/3 x 73 = 1437.33 m3 (ii) Volume of sphere = 4/3 πr3 = 22/7 x 4/3 x (0.63)3 = 1.05m3… Continue reading Surface Area and Volumes – Exercise 13.8 – Class IX

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