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如图19-1-3,将矩形ABCD沿对角线BD折叠,使BC与AD交于点E.若AD=8cm,AB=4cm,求△BDE的面积.
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2015•乐山如图将矩形纸片ABCD沿对角线BD折叠使点A.落在平面上的F.点处DF交BC于点E.1
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如图6矩形ABCD中对角线AC=E.为BC边上一点BC=3BE将矩形ABCD沿AE所在的直线折叠B.
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