问1道关于圆的数学题21.如图,AB为圆O的直径,弦CD⊥AB于点M,过点B做BE‖CD,交AC的延长线于点E,连接BC.(1)求证:BE为圆O的切线.(2)如果CD=6,tan∠BCD=0.5,求圆O的直径.
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![问1道关于圆的数学题21.如图,AB为圆O的直径,弦CD⊥AB于点M,过点B做BE‖CD,交AC的延长线于点E,连接BC.(1)求证:BE为圆O的切线.(2)如果CD=6,tan∠BCD=0.5,求圆O的直径.](/uploads/image/z/8410253-5-3.jpg?t=%E9%97%AE1%E9%81%93%E5%85%B3%E4%BA%8E%E5%9C%86%E7%9A%84%E6%95%B0%E5%AD%A6%E9%A2%9821.%E5%A6%82%E5%9B%BE%2CAB%E4%B8%BA%E5%9C%86O%E7%9A%84%E7%9B%B4%E5%BE%84%2C%E5%BC%A6CD%E2%8A%A5AB%E4%BA%8E%E7%82%B9M%2C%E8%BF%87%E7%82%B9B%E5%81%9ABE%E2%80%96CD%2C%E4%BA%A4AC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8E%E7%82%B9E%2C%E8%BF%9E%E6%8E%A5BC.%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9ABE%E4%B8%BA%E5%9C%86O%E7%9A%84%E5%88%87%E7%BA%BF.%EF%BC%882%EF%BC%89%E5%A6%82%E6%9E%9CCD%3D6%2Ctan%E2%88%A0BCD%3D0.5%2C%E6%B1%82%E5%9C%86O%E7%9A%84%E7%9B%B4%E5%BE%84.)
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