Question

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

Answer 1

Answer:

3.5 cm

Step-by-step explanation:

TSA of sphere = 4πr ^2

Thus,

4 × ( 22 / 7 ) × r^2 = 154

r ^2 = ( 154 × 7 ) / ( 22 × 4 )

r ^2 = 49 / 4

r = ✓ ( 49 / 4 )

r = 7 / 2

r = 3.5 cm

Answer 2

refer to the attachment spider man