Surface area of a sphere of diameter ‘d’ = πd2(i) d is 14 cm⇒ surface area = (22/7) × (14)2 = 616 cm2(ii) d is 21 cm⇒ surface area = (22/7) × (21)2 = 1386 cm2(iii) d is 3.5 cm⇒ surface area = (22/7) × (3.5)2 = 38.5cm2

Q. 24.0( 15 Votes )

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Class 9th RD Sharma - Mathematics 21. Surface Area and Volume of a Sphere

Answer :

Surface area of a sphere of diameter ‘d’ = πd²

(i) d is 14 cm

⇒ surface area = (22/7) × (14)² = 616 cm²

(ii) d is 21 cm

⇒ surface area = (22/7) × (21)² = 1386 cm²

(iii) d is 3.5 cm

⇒ surface area = (22/7) × (3.5)² = 38.5cm²

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