正方形面积是16
说明正方形边长是4（这样4²=16）
那么对角线的长度是4√2
圆的半径是对角线长度的一半r=2√2
S=πr²=8π
估计是印刷错误吧,排版的人把8看成6了,答案应该是8π的.
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一道gmat数学题In the figureabove, a square
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