Find the surface area of a sphere of diameter :
(i) 14 cm
(ii) 21 cm
(iii) 3.5 cm
Answers
Answer:
this is the answer of 13.4 que 2
(i) Given : Diameter of sphere = 14 cm
Radius of sphere, r = Diameter/2
r = 14/2 cm
r = 7 cm
Surface area of sphere = 4πr²
= 4 × 22/7 × 7²
= 4 × 22/7 × 49
= 4 × 22 × 7
= 616 cm²
Hence, the Surface area is 616 cm²
(ii) Diameter of sphere = 21cm
Radius of sphere, r = Diameter/2
r = 21/2 cm
r = 10.5 cm
Surface area of sphere = 4 × 22/7 × 10.5²
= 4 × 22/7 × 10.5²
= 4 × 22/7 × 10.5 × 10.5
= 1386 cm²
Hence, the Surface area is 1386 cm².
(iii) Diameter of sphere = 3.5 cm
Radius of sphere , r = Diameter/2
r = 3.5/2 cm
r = 1.75 cm
Surface area = 4 × 22/7 × 1.75²
= 38.5 cm²
Hence, the Surface area is 38.5 cm².
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