如图,AB是⊙O的直径,AD是弦,OC垂直AD于F交⊙O于E,连接DE、BE,且∠C=∠BED.(1)求证:AC是⊙O的切线;(2)若OA=10,AD=16,求AC的长.789
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![如图,AB是⊙O的直径,AD是弦,OC垂直AD于F交⊙O于E,连接DE、BE,且∠C=∠BED.(1)求证:AC是⊙O的切线;(2)若OA=10,AD=16,求AC的长.789](/uploads/image/z/6876580-4-0.jpg?t=%E5%A6%82%E5%9B%BE%2CAB%E6%98%AF%E2%8A%99O%E7%9A%84%E7%9B%B4%E5%BE%84%2CAD%E6%98%AF%E5%BC%A6%2COC%E5%9E%82%E7%9B%B4AD%E4%BA%8EF%E4%BA%A4%E2%8A%99O%E4%BA%8EE%2C%E8%BF%9E%E6%8E%A5DE%E3%80%81BE%2C%E4%B8%94%E2%88%A0C%3D%E2%88%A0BED%EF%BC%8E%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9AAC%E6%98%AF%E2%8A%99O%E7%9A%84%E5%88%87%E7%BA%BF%EF%BC%9B%EF%BC%882%EF%BC%89%E8%8B%A5OA%3D10%2CAD%3D16%2C%E6%B1%82AC%E7%9A%84%E9%95%BF%EF%BC%8E789)
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