【高一数学】几何题目》》》》如图,正方形ABCD的边长为1,P,Q分别为边AB,DA上的点.当三角形APQ的周长为2时,求角PCQ的大小.写出过程和答案,谢谢.
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![【高一数学】几何题目》》》》如图,正方形ABCD的边长为1,P,Q分别为边AB,DA上的点.当三角形APQ的周长为2时,求角PCQ的大小.写出过程和答案,谢谢.](/uploads/image/z/2833307-35-7.jpg?t=%E3%80%90%E9%AB%98%E4%B8%80%E6%95%B0%E5%AD%A6%E3%80%91%E5%87%A0%E4%BD%95%E9%A2%98%E7%9B%AE%E3%80%8B%E3%80%8B%E3%80%8B%E3%80%8B%E5%A6%82%E5%9B%BE%2C%E6%AD%A3%E6%96%B9%E5%BD%A2ABCD%E7%9A%84%E8%BE%B9%E9%95%BF%E4%B8%BA1%2CP%2CQ%E5%88%86%E5%88%AB%E4%B8%BA%E8%BE%B9AB%2CDA%E4%B8%8A%E7%9A%84%E7%82%B9.%E5%BD%93%E4%B8%89%E8%A7%92%E5%BD%A2APQ%E7%9A%84%E5%91%A8%E9%95%BF%E4%B8%BA2%E6%97%B6%2C%E6%B1%82%E8%A7%92PCQ%E7%9A%84%E5%A4%A7%E5%B0%8F.%E5%86%99%E5%87%BA%E8%BF%87%E7%A8%8B%E5%92%8C%E7%AD%94%E6%A1%88%2C%E8%B0%A2%E8%B0%A2.)
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