Question

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

Answer 1

Answer: 3.5 cm

Explanation:

Surface area of a sphere = 4 π r²

Also, given that the surface area of the sphere = 154 cm²

ie, 4 π r²  =  154

ie, 4 × 22/7 × r² = 154

ie, r² = 154 × 7  

            4 × 22

ie, r² = 7 × 7

             4

ie, r = √49/4

      = 7/2

      = 3.5 cm

HOPE THIS HELPS........

Answer 2

for answer refer to attachment