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勾广三,股修四,径隅五。
商高是用具体数字来回答问题的如果一个直角三角形两个直角边勾和股的长度分别为3和4那么斜边的长度就是5。虽然商高的回答没有述说一般性的结论但商高显然知道对应直角边成比例的两个直角三角形相似因此我们可以把商高的述说理解为一般性的结论。《周髀算经》没有对定理进行证明。
现在我们知道,这个关系可以用符号表示为