Question

find the radius of a sphere whose surface area is 154cm

Answer 1

Let the sphere of the radius = r.

We know that Surface area = 4pir^2

Given that Surface area = 154cm.

4pir^2 = 154

4 * 22/7 * r^2 = 154

88r^2 = 1078

r^2 = 1078/88

r^2 = 12.25

$r = \sqrt{12.25}$

r = 3.5cm.


Therefore the radius of the sphere = 3.5cm.


Hope this helps!

Answer 2

3.5cm
154=4pi r ^2
substitute the values and u will get r as 3.5cm