Calculate the area of a sphere when its diameter is

a) [[$ 5 $]] m.

Answer: The area of the sphere is m[[$ ^2 $]].

b) [[$ 78 $]] cm.

Answer: The area of the sphere is cm[[$ ^2 $]].

c) [[$ 64 $]] mm.

Answer: The area of the sphere is mm[[$ ^2 $]].

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