如图，AD是△ABC的角平分线 DE平行于AC,DF平行于AB （1）求证：四边形AEDF是菱形
如图，AD是△ABC的角平分线DE平行于AC,DF平行于AB（1）求证：四边形AEDF是菱形（2）再添加一个条件，使四边形AEDF是正方形，说明理由...
如图，AD是△ABC的角平分线
DE平行于AC,DF平行于AB
（1）求证：四边形AEDF是菱形
（2）再添加一个条件，使四边形AEDF是正方形，说明理由 展开
DE平行于AC,DF平行于AB
（1）求证：四边形AEDF是菱形
（2）再添加一个条件，使四边形AEDF是正方形，说明理由 展开
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角FAD=角FDA，则DF=AF，同理，DE=AE，接着证明三角形DFA全等于三角形AED，则DF=AE，所以AEDF四条边相等，为菱形。
加条件：角BAC=90度，四边形为菱形且有一个角为直角，四边形为正方形。
加条件：角BAC=90度，四边形为菱形且有一个角为直角，四边形为正方形。
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2024-07-24 广告
同轴线介电常数是指同轴电缆中介质对电场的响应能力，通常用ε_r表示，是介质相对于真空或空气的电容率。这一参数直接影响信号在电缆中的传播速度和效率。在选择同轴电缆时，需要考虑其介电常数，因为它与电缆的插入损耗、带宽和传输质量等性能密切相关。创...
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