题目
在平行四边形ABCD中,角BAD的平分线交BC于点E,若AD=12厘米,CD=8厘米,求CE的长
提问时间:2020-11-23
答案
解: 因为BC平分∠BAD,所以∠DAE=∠BAE. 因为AB‖CD,所以∠DAE=∠AEB(两直线平行,内错角相等) 所以:∠BAE=∠AEB(等量代换) 所以:AB=BE(同一三角形,等角对等边) 又因为CE=CB-BE,且CB=AD=12cm=BC,BE=AB=CD=8cm 所...
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