Question

Find the radius of a sphere whose surface area is 154 cm2.

Answer 1

Answer:

Step-by-step explanation:

Given :-

Surface area of Sphere =  154 cm²

To Find :-

Radius of Sphere

Formula to be used :-

Surface area of sphere = 4πr²

Solution :-

Let radius of the sphere be r

Surface area of sphere = 4πr²

$\sf\implies 154 = 4\pi r^2\\\\\sf\implies 154 = 4 \times \frac{22}{7}\times r^2\\\\\sf\implies r^2= \frac{154\times7}{4\times22}\\\\\sf\implies r^2=49/4\\\\\sf\implies r=7/2 cm\\\\\bf\implies r= 3.5 cm$

Hence, the Radius of Sphere is 3.5 cm.