Question

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

Answer 1

◆Ekansh Nimbalkar◆
hello friend here is your required answer

Let r be the radius of the sphere
surface area of the sphere=4πr sq
Also surface area=154cm sq
4π sq=154
4×22/7×r sq=154
r sq=154×7/4×22=12.25
r=+√12.25=3.5
Hence the radius of the sphere=3.5cm

Answer 2

Hello there !!!

Radius = r

Surface area = 4/3πr²

4 × 22/7 ×r² = 154 cm²

22/7 ×r² = 154 /4
= 38.5

r² = 38.5 x 7 /22
= 12.25

r = √12.25
= 3.5 cm

Hence ,
radius is 3.5 cm