如图,已知正方形ABCD的边长为1,P,Q分别为边AB,DA上的点.当△APQ的周长为2,求∠PCQ(不用余弦定理做)
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![如图,已知正方形ABCD的边长为1,P,Q分别为边AB,DA上的点.当△APQ的周长为2,求∠PCQ(不用余弦定理做)](/uploads/image/z/3747235-67-5.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%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%E2%96%B3APQ%E7%9A%84%E5%91%A8%E9%95%BF%E4%B8%BA2%2C%E6%B1%82%E2%88%A0PCQ%EF%BC%88%E4%B8%8D%E7%94%A8%E4%BD%99%E5%BC%A6%E5%AE%9A%E7%90%86%E5%81%9A%EF%BC%89)
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