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蝴蝶定理:设M是圆的弦AB的中点,过M作圆的任意两条异于AB的弦CD、EF,线段CF、DE分别交AB于G、H两点,则MG=MH。这个优美的数学名题,曾得到众多数学爱好者的青睐.美国人坎迪
Butterfly Theorem: Let M be the midpoint of the round string AB, and any two lines that make M over the circle will be different from the strings CD and EF of AB. The line segments CF and DE respectively intersect AB at G and H, then MG=MH. This beautiful mathematical title has won the favor of many math lovers. Americans Candi