Surface area of a shere = 4πr2, where r is radius(i) r is 10.5 cm⇒ surface area = 4 × (22/7) × (10.5)2 = 1386 cm2(ii) r is 5.6 cm⇒ surface area = 4 × (22/7) × 5.62 = 394.24 cm2(iii) r is 14 cm⇒ surface area = 4 × (22/7) × 142 = 2464 cm2

Q. 14.7( 27 Votes )

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

Answer :

Surface area of a shere = 4πr², where r is radius

(i) r is 10.5 cm

⇒ surface area = 4 × (22/7) × (10.5)² = 1386 cm²

(ii) r is 5.6 cm

⇒ surface area = 4 × (22/7) × 5.6² = 394.24 cm²

(iii) r is 14 cm

⇒ surface area = 4 × (22/7) × 14² = 2464 cm²

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