等腰梯形ABCD中,AD||BC,AB=DC,点P是腰DC上一动点(P与D,C不重合)点E,F,G分别是线段BC,PC,BP的中问 若角A=120度,AD=2,DC=4,当PC为何值时,四边形EFPG是矩形?并加以说明.
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![等腰梯形ABCD中,AD||BC,AB=DC,点P是腰DC上一动点(P与D,C不重合)点E,F,G分别是线段BC,PC,BP的中问 若角A=120度,AD=2,DC=4,当PC为何值时,四边形EFPG是矩形?并加以说明.](/uploads/image/z/11550934-46-4.jpg?t=%E7%AD%89%E8%85%B0%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%7C%7CBC%2CAB%3DDC%2C%E7%82%B9P%E6%98%AF%E8%85%B0DC%E4%B8%8A%E4%B8%80%E5%8A%A8%E7%82%B9%EF%BC%88P%E4%B8%8ED%2CC%E4%B8%8D%E9%87%8D%E5%90%88%EF%BC%89%E7%82%B9E%2CF%2CG%E5%88%86%E5%88%AB%E6%98%AF%E7%BA%BF%E6%AE%B5BC%2CPC%2CBP%E7%9A%84%E4%B8%AD%E9%97%AE+%E8%8B%A5%E8%A7%92A%3D120%E5%BA%A6%2CAD%3D2%2CDC%3D4%2C%E5%BD%93PC%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2EFPG%E6%98%AF%E7%9F%A9%E5%BD%A2%3F%E5%B9%B6%E5%8A%A0%E4%BB%A5%E8%AF%B4%E6%98%8E.)
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