Question

Find the total surface area of a sphere of diameter. (i) 14 cm (ii)5.6cm (iii) 3.5m

Answer 1

Total surface area of a sphere of radius r is given by the formula:

$TSA = 4\pi {r}^{2}$
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Case- I

diameter = 14 cm

radius , r = 14/2 = 7 cm

TSA = 4 × 22/7 × 7^2 = 616 cm^2
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Case- II

diameter = 5.6 cm

radius , r = 5.6/2 = 2.8 cm

TSA = 4 × 22/7 × 2.8^2 = 98.56 cm^2
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Case- III

diameter = 3.5 cm

radius , r = 3.5/2 = 1.75 cm

TSA = 4 × 22/7 × 1.75^2 = 38.5 cm^2
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