2. Find the surface area of a sphere of diameter 21 cm.
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1
Answer:
Diameter of sphere = 21 cm
∴ Radius of sphere = 21/2 cm
∴ Surface area of sphere = 4πr2
= 4 × 22/7 × 21/2 × 21/2
= 1386 cm2
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Total surface area of sphere = 4πr^2
diamerer = 2r
21 = 2 x r
r =21/2
put in that
4 x 22/7 x 21/2 x 21/2
2 x 11 x 3 x 21
22 x 63
1386
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