Question

Find the radius of a sphere whose tatal surface area is 154 cm square

Answer 1

Answer:

Let 'r' be the radius of sphere

Surface area of sphere = 4πr2

⇒ 154 = 4πr2 ⇒ 154 = 4 x 22/7 x r2

⇒ r2 = 154 x 7/4 x 22 = 49/4

⇒ r = 7/2 cm = 3.5 cm

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