在正方形ABCD和平行四边形BEFG中,点A、B、E在同一条直线上,P是线段DF的中点,连接PG、PC.PG与PC的夹角为多少度时,四边形BEFG是正方形.如图:*注意:本题的图为上图的左边的图.原图中PH是没有连
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![在正方形ABCD和平行四边形BEFG中,点A、B、E在同一条直线上,P是线段DF的中点,连接PG、PC.PG与PC的夹角为多少度时,四边形BEFG是正方形.如图:*注意:本题的图为上图的左边的图.原图中PH是没有连](/uploads/image/z/5465880-0-0.jpg?t=%E5%9C%A8%E6%AD%A3%E6%96%B9%E5%BD%A2ABCD%E5%92%8C%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2BEFG%E4%B8%AD%2C%E7%82%B9A%E3%80%81B%E3%80%81E%E5%9C%A8%E5%90%8C%E4%B8%80%E6%9D%A1%E7%9B%B4%E7%BA%BF%E4%B8%8A%2CP%E6%98%AF%E7%BA%BF%E6%AE%B5DF%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E8%BF%9E%E6%8E%A5PG%E3%80%81PC.PG%E4%B8%8EPC%E7%9A%84%E5%A4%B9%E8%A7%92%E4%B8%BA%E5%A4%9A%E5%B0%91%E5%BA%A6%E6%97%B6%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2BEFG%E6%98%AF%E6%AD%A3%E6%96%B9%E5%BD%A2.%E5%A6%82%E5%9B%BE%EF%BC%9A%2A%E6%B3%A8%E6%84%8F%EF%BC%9A%E6%9C%AC%E9%A2%98%E7%9A%84%E5%9B%BE%E4%B8%BA%E4%B8%8A%E5%9B%BE%E7%9A%84%E5%B7%A6%E8%BE%B9%E7%9A%84%E5%9B%BE.%E5%8E%9F%E5%9B%BE%E4%B8%ADPH%E6%98%AF%E6%B2%A1%E6%9C%89%E8%BF%9E)
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