如图所示 AB为圆O的直径 D是弧BC的中点 DE⊥AC交AC的延长线于点E 圆O的切线BF交AD的延长线于点E圆O的切线BF交AD的延长线于点F(1)求证:DE是圆O的切线(2)若DE=3 圆O的半径为5 求BF的长
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![如图所示 AB为圆O的直径 D是弧BC的中点 DE⊥AC交AC的延长线于点E 圆O的切线BF交AD的延长线于点E圆O的切线BF交AD的延长线于点F(1)求证:DE是圆O的切线(2)若DE=3 圆O的半径为5 求BF的长](/uploads/image/z/2385450-18-0.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA+AB%E4%B8%BA%E5%9C%86O%E7%9A%84%E7%9B%B4%E5%BE%84+D%E6%98%AF%E5%BC%A7BC%E7%9A%84%E4%B8%AD%E7%82%B9+DE%E2%8A%A5AC%E4%BA%A4AC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8E%E7%82%B9E+%E5%9C%86O%E7%9A%84%E5%88%87%E7%BA%BFBF%E4%BA%A4AD%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8E%E7%82%B9E%E5%9C%86O%E7%9A%84%E5%88%87%E7%BA%BFBF%E4%BA%A4AD%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8E%E7%82%B9F%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9ADE%E6%98%AF%E5%9C%86O%E7%9A%84%E5%88%87%E7%BA%BF%EF%BC%882%EF%BC%89%E8%8B%A5DE%3D3+%E5%9C%86O%E7%9A%84%E5%8D%8A%E5%BE%84%E4%B8%BA5+%E6%B1%82BF%E7%9A%84%E9%95%BF)
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