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  3. What is the area of a circle whose radius is the diagonal of a square whose area is 4?

What is the area of a circle whose radius is the diagonal of a square whose area is 4?

admin2012-01-15  10
问题 What is the area of a circle whose radius is the diagonal of a square whose area is 4?
选项 A、2π
B、2π
C、4π
D、8π
E、16π
答案D
解析
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