求证：斜边上的高和斜边对应相等的两个直角三角形全等

Rt△ACB和Rt△A‘C’B‘中CD,C'D'为高O,O'为斜边中点,连结CO,C'O'.∴Rt△CDO≌Rt△C’D‘O’ ﹙HL﹚∴∠COD=∠C'O'D'∵∠COD=2∠B,∠C'O'D'=2∠B'∴∠B=∠B'Rt△ACB和Rt△A‘C’B‘中∠B=∠B,∠C=∠C',AB=A'B'∴Rt△...