延长DE到F使EF=BC.由条件有角ABC=AEF.AB=AE所以三角形ABC全等于AEF,AC=AE.再可证ACD全等于ADF即可CD=DF=BC+DE
五边形ABCDE中,AB=AE,∠ABC+∠AED=180°.连AC、AD且∠CAD=∠BAC+∠DAE.求证:CD=D
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