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勾股弦定理是三角学上的一个很重要的定理,它的条文是:“一个直角形,斜边的平方,等于其他两边平方的和”。这条定理发现很早,在我国一部很古的数学著作——“周髀算经”上,已有“弦方等于勾方加股方”的记载了。这里所说的弦,是直角三角形的斜边,而勾和股是其他两边。但是,西方国家却把这条定理叫做毕达哥拉斯定理,说它是古希腊学者毕达哥拉斯发现的。又说
The Pythagorean theorem is a very important theorem in trigonometry. Its article reads: “A rectangular shape, the square of the hypotenuse equals the sum of squares of the other two sides.” This theorem was discovered very early. In an ancient Chinese mathematics book, Zhouyi Sutra, there has been a record that “a string is equal to a hook plus party.” The string mentioned here is the hypotenuse of the right triangle, and the hook and the strand are the other two sides. However, Western countries called this theorem Pythagorean theorem, saying that it was discovered by Pythagoras, an ancient Greek scholar. Say again