1.已知在正方形ABCD中∠ECF=45°,△CBE绕着点C顺时针旋转到△CDP求证[1]EF=PF[2]直线EF与以C为圆心,CD为半径的圆相切吗,为什么? 2.知∠ACB=∠BDC=60°,AC等于二倍根号三cm求[1]∠BAC度数[2]求圆O的周长
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![1.已知在正方形ABCD中∠ECF=45°,△CBE绕着点C顺时针旋转到△CDP求证[1]EF=PF[2]直线EF与以C为圆心,CD为半径的圆相切吗,为什么? 2.知∠ACB=∠BDC=60°,AC等于二倍根号三cm求[1]∠BAC度数[2]求圆O的周长](/uploads/image/z/3899311-7-1.jpg?t=1.%E5%B7%B2%E7%9F%A5%E5%9C%A8%E6%AD%A3%E6%96%B9%E5%BD%A2ABCD%E4%B8%AD%E2%88%A0ECF%3D45%C2%B0%2C%E2%96%B3CBE%E7%BB%95%E7%9D%80%E7%82%B9C%E9%A1%BA%E6%97%B6%E9%92%88%E6%97%8B%E8%BD%AC%E5%88%B0%E2%96%B3CDP%E6%B1%82%E8%AF%81%5B1%5DEF%3DPF%5B2%5D%E7%9B%B4%E7%BA%BFEF%E4%B8%8E%E4%BB%A5C%E4%B8%BA%E5%9C%86%E5%BF%83%2CCD%E4%B8%BA%E5%8D%8A%E5%BE%84%E7%9A%84%E5%9C%86%E7%9B%B8%E5%88%87%E5%90%97%2C%E4%B8%BA%E4%BB%80%E4%B9%88%3F++++++2.%E7%9F%A5%E2%88%A0ACB%3D%E2%88%A0BDC%3D60%C2%B0%2CAC%E7%AD%89%E4%BA%8E%E4%BA%8C%E5%80%8D%E6%A0%B9%E5%8F%B7%E4%B8%89cm%E6%B1%82%5B1%5D%E2%88%A0BAC%E5%BA%A6%E6%95%B0%5B2%5D%E6%B1%82%E5%9C%86O%E7%9A%84%E5%91%A8%E9%95%BF)
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