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28/07/2021 10:27 am
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Find the surface area of a sphere of radius:
(i) 10.5 cm (ii) 5.6 cm (iii) 14 cm
(Assume π = 22/7)
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28/07/2021 10:29 am
Surface area of sphere (SA) = 4πr2
(i) Radius of sphere, r = 10.5 cm
SA = 4 × (22/7) × 10.52
= 1386
Surface area of sphere is 1386 cm2
(ii) Radius of sphere, r = 5.6 cm
Using formula,
SA = 4 × (22/7) × 5.62
= 394.24
Surface area of sphere is 394.24 cm2
(iii) Radius of sphere, r = 14 cm
SA = 4πr2
= 4 × (22/7) × (14)2
= 2464
Surface area of sphere is 2464 cm2