Find the surface area of a sphere of diameter:(i) 14 cm (ii) 21 cm (iii) 3.5 m

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(i) Radius (r) of sphere = Surface area of sphere = 4πr2 Therefore, the surface area of a sphere having diameter 14 cm is 616 cm2. (ii) Radius (r) of sphere = Surface area of sphere = 4πr2 Therefore, the surface area of a sphere having diameter 21 cm is 1386 cm2. (iii) Radius (r) of sphere =...
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(i) Radius (r) of sphere = Surface area of sphere = 4πr2 Therefore, the surface area of a sphere having diameter 14 cm is 616 cm2. (ii) Radius (r) of sphere = Surface area of sphere = 4πr2 Therefore, the surface area of a sphere having diameter 21 cm is 1386 cm2. (iii) Radius (r) of sphere =m Surface area of sphere = 4πr2 Therefore, the surface area of the sphere having diameter 3.5 m is 38.5 m2. read less
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(i) Surface area of the sphere = 4πr² = (4 × 22/7 × 7 × 7) cm²= 616 cm². (ii) Surface area = 4 × 22/7 × 10.5 × 10.5 = 1386 cm². (iii) Surface area = 4 × 22/7 × 1.75 × 1.75 = 38.5 cm².
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(i) 615.44 (ii) 1384.74 (iii) 38.465
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