Question

If the surface area of a sphere is 616 cm, then its radius is
(a) 6
(b) 7
(c) 8
(d) 5​

Answer 1

Answer:

7cm

Step-by-step explanation:

We know surface area of a sphere is S = 4πr²

We have to find radius of the sphere = r =

$= > r \: = \: \sqrt{ \frac{s}{4\pi} } \\ = > r \: = \: \sqrt{ \frac{616}{4 \times 3.1415} } \\ = > r \: = \: \sqrt{49} = 7cm$

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