Question

Radius of the sphere whose surface area is 154

Answer 1

Question:

Radius of the sphere whose surface area is 154?

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

=

${r}^{2} = \: \sqrt{47 \div 7}$

⇒ r = 7/2 cm

= 3.5 cm

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Answer 2

surface area of sphere =4πr^2
.'. radius of sphere is 3.5


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