Question

20. The surface area of a sphere is 616 cm2. Find its diameter.​

Answer 1

Answer:

Diameter=14

Step-by-step explanation:

Surface area of sphere=4πr^2

616=4×22/7×r^2

r^2=616×7/4×22

r^2=7×7

r=7

Diameter=2×7=14

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Answer 2

Answer:

Surface area of a sphere is 4πr^2.

Step-by-step explanation:

4πr^2=616

πr^2=616/4

πr^2=154

22/7×r×r=154

r^2=154×7/22

r^2=1078/22

r^2=49

r=√49

r=7

Hence, diameter=2r

diameter=14 cm.

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