Question

Find the radious of a sphere whise surface area is 154cm^2

Answer 1

Hey there !

Total Surface Area = 154 cm²

Total Surface Area of Sphere = 4πr²

=> 4πr² = 154

=> πr² = 154 / 4

=> πr² = 38.5

Taking π to be 22 / 7 we get,

=> 22 / 7 × r² = 38.5

=> r² = 38.5 × 7 / 22

=> r² = 12.25

=> r = √ 12.25

=> r = 3.5 cm

Hence the radius of the sphere is 3.5 cm.

Hope my answer helped !