In China, spheres are used to exercise a person's hands. If the diameter of a sphere is 2 inches, how many square inches are in its surface area? Express your answer in terms of $\pi$.
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<|im_start|>user
In China, spheres are used to exercise a person's hands. If the diameter of a sphere is 2 inches, how many square inches are in its surface area? Express your answer in terms of $\pi$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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user
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In China, spheres are used to exercise a person's hands. If the diameter of a sphere is 2 inches, how many square inches are in its surface area? Express your answer in terms of $\pi$.
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