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对大小和形状的研究被称为几何。几何历史上最古老和最有影响的问题之一是:正方形对角线长度是多少?

当然,这个问题是在问对角线和边长之比。让我们假设正方形边长为1,对角线长度为\(d\)。如图:

\(d^2=2\) $$\frac{a}{b} \times \frac{a}{b}=2$$

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