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A sphere has the surface area of 81π. What is its diameter?

A sphere has the surface area of 81π. What is its diameter?

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Answer #1

Let us assume that the diameter of the sphere is , then the radius of the sphere is given as:

Then the surface area of the sphere is given as:

Since it has been given that the surface area of the given sphere is , therefore:

Therefore, the diameter of the sphere is 9.

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