大家知道,在普通直角三角形中,短直角边叫勾,长直角边叫股,斜边叫弦。勾、股、弦之间存在一种特殊关系:勾的平方加股的平方,等于弦的平方,这就是勾股定理。 As we all know, in ordinary right-angled triangles, short squares are called hooks, long-cornered edges are called stocks, and beveled edges are called strings. There is a special relationship between hooks, stocks, and strings: The square of the hook plus the square of the stock equals the square of the string, which is the Pythagorean Theorem.