Question

Sample 6 Find the radius of a sphere whose
surface area is 154 cm
[CBSE 2012, 2017)
Sol.



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Answer 1

Answer:

Step-by-step explanation:

let radius of sphere = r

surface area of sphere = 154 cm^2

surface area of sphere =4 π $r^{2}$

154 = 4 π $r^{2}$

$r^{2}$ = 154 / (4*Pi)

r^2 = 12.25

Taking square root

r = 3.5