(2008•福州)如图:AB是⊙O的直径,AD是弦,∠DAB=22.5°,延长AB到点C,使得∠ACD=45°.111(2008•福州)如图:AB是⊙O的直径,AD是弦,∠DAB=22.5°,延长AB到点C,使得∠ACD=45°.(1)求证:CD是⊙O
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![(2008•福州)如图:AB是⊙O的直径,AD是弦,∠DAB=22.5°,延长AB到点C,使得∠ACD=45°.111(2008•福州)如图:AB是⊙O的直径,AD是弦,∠DAB=22.5°,延长AB到点C,使得∠ACD=45°.(1)求证:CD是⊙O](/uploads/image/z/3719648-56-8.jpg?t=%EF%BC%882008%26%238226%3B%E7%A6%8F%E5%B7%9E%EF%BC%89%E5%A6%82%E5%9B%BE%EF%BC%9AAB%E6%98%AF%E2%8A%99O%E7%9A%84%E7%9B%B4%E5%BE%84%2CAD%E6%98%AF%E5%BC%A6%2C%E2%88%A0DAB%3D22.5%C2%B0%2C%E5%BB%B6%E9%95%BFAB%E5%88%B0%E7%82%B9C%2C%E4%BD%BF%E5%BE%97%E2%88%A0ACD%3D45%C2%B0%EF%BC%8E111%EF%BC%882008%26%238226%3B%E7%A6%8F%E5%B7%9E%EF%BC%89%E5%A6%82%E5%9B%BE%EF%BC%9AAB%E6%98%AF%E2%8A%99O%E7%9A%84%E7%9B%B4%E5%BE%84%2CAD%E6%98%AF%E5%BC%A6%2C%E2%88%A0DAB%3D22.5%C2%B0%2C%E5%BB%B6%E9%95%BFAB%E5%88%B0%E7%82%B9C%2C%E4%BD%BF%E5%BE%97%E2%88%A0ACD%3D45%C2%B0%EF%BC%8E%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9ACD%E6%98%AF%E2%8A%99O)
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