(2013•大连)如图,AB是⊙O的直径,CD与⊙O相切于点C,DA⊥AB,DO及DO的延长线与⊙O分别相交于点E、F,EB与CF相交于点G.(1)求证:DA=DC;(2)⊙O的半径为3,DC=4,求CG的长.(1)不用 只求(2)
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![(2013•大连)如图,AB是⊙O的直径,CD与⊙O相切于点C,DA⊥AB,DO及DO的延长线与⊙O分别相交于点E、F,EB与CF相交于点G.(1)求证:DA=DC;(2)⊙O的半径为3,DC=4,求CG的长.(1)不用 只求(2)](/uploads/image/z/8266748-68-8.jpg?t=%EF%BC%882013%26%238226%3B%E5%A4%A7%E8%BF%9E%EF%BC%89%E5%A6%82%E5%9B%BE%2CAB%E6%98%AF%E2%8A%99O%E7%9A%84%E7%9B%B4%E5%BE%84%2CCD%E4%B8%8E%E2%8A%99O%E7%9B%B8%E5%88%87%E4%BA%8E%E7%82%B9C%2CDA%E2%8A%A5AB%2CDO%E5%8F%8ADO%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%B8%8E%E2%8A%99O%E5%88%86%E5%88%AB%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9E%E3%80%81F%2CEB%E4%B8%8ECF%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9G%EF%BC%8E%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9ADA%3DDC%EF%BC%9B%EF%BC%882%EF%BC%89%E2%8A%99O%E7%9A%84%E5%8D%8A%E5%BE%84%E4%B8%BA3%2CDC%3D4%2C%E6%B1%82CG%E7%9A%84%E9%95%BF%EF%BC%8E%EF%BC%881%EF%BC%89%E4%B8%8D%E7%94%A8+%E5%8F%AA%E6%B1%82%EF%BC%882%EF%BC%89)
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(2013•大连)如图,AB是⊙O的直径,CD与⊙O相切于点C,DA⊥AB,DO及DO的延长线与⊙O分别相交于点E、F,EB与CF相交于点G.(1)求证:DA=DC;(2)⊙O的半径为3,DC=4,求CG的长.(1)不用 只求(2)
(2013•大连)如图,AB是⊙O的直径,CD与⊙O相切于点C,DA⊥AB,DO及DO的延长线与⊙O分别相交于点E、F,EB与CF相交于点G.
(1)求证:DA=DC;
(2)⊙O的半径为3,DC=4,求CG的长.
(1)不用 只求(2)。
(2013•大连)如图,AB是⊙O的直径,CD与⊙O相切于点C,DA⊥AB,DO及DO的延长线与⊙O分别相交于点E、F,EB与CF相交于点G.(1)求证:DA=DC;(2)⊙O的半径为3,DC=4,求CG的长.(1)不用 只求(2)