Question

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

Answer 1

Answer:

CSA of sphere = 2πr = 154

2 × 22/7 × r = 154

22/7 × r = 154/2

22/7 × r = 77

r = 77 × 7 /22

r = 24.5 cm

therefore the radius of sphere is 24.5 cm

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Answer 2

Answer:

Given:

area of the sphere=154

We know that , area of a sphere=4πr²

so, 4πr²=154

4×22/7×r²=154

r²=154×7/88

r²=12.25

r=√12.25

r=3.5 cm