Given, Surface area of the sphere = 154

Let the radius of the sphere be r.

We know that formula to find the surface area of the sphere = 4πr² 

Using formula, 4πr² = 154

r² = (154×7)/(4×22) = (49/4)

r = (7/2) = 3.5

The radius of the sphere is 3.5 cm.