六边形ABCDEF内接于半径为r(常数)的⊙O,其中AD为直径,且AB=CD=DE=FA.1、当∠BAD=75°时,求弧BC的长; 21、当∠BAD=75°时,求弧BC的长;2、求证:BC∥AD∥FE3 ·六边形ABCDEF内接于半径为r的圆O,AB=CD=DE=F
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![六边形ABCDEF内接于半径为r(常数)的⊙O,其中AD为直径,且AB=CD=DE=FA.1、当∠BAD=75°时,求弧BC的长; 21、当∠BAD=75°时,求弧BC的长;2、求证:BC∥AD∥FE3 ·六边形ABCDEF内接于半径为r的圆O,AB=CD=DE=F](/uploads/image/z/7119054-54-4.jpg?t=%E5%85%AD%E8%BE%B9%E5%BD%A2ABCDEF%E5%86%85%E6%8E%A5%E4%BA%8E%E5%8D%8A%E5%BE%84%E4%B8%BAr%28%E5%B8%B8%E6%95%B0%29%E7%9A%84%E2%8A%99O%2C%E5%85%B6%E4%B8%ADAD%E4%B8%BA%E7%9B%B4%E5%BE%84%2C%E4%B8%94AB%3DCD%3DDE%3DFA.1%E3%80%81%E5%BD%93%E2%88%A0BAD%EF%BC%9D75%C2%B0%E6%97%B6%2C%E6%B1%82%E5%BC%A7BC%E7%9A%84%E9%95%BF%EF%BC%9B+21%E3%80%81%E5%BD%93%E2%88%A0BAD%EF%BC%9D75%C2%B0%E6%97%B6%EF%BC%8C%E6%B1%82%E5%BC%A7BC%E7%9A%84%E9%95%BF%EF%BC%9B2%E3%80%81%E6%B1%82%E8%AF%81%EF%BC%9ABC%E2%88%A5AD%E2%88%A5FE3+%C2%B7%E5%85%AD%E8%BE%B9%E5%BD%A2ABCDEF%E5%86%85%E6%8E%A5%E4%BA%8E%E5%8D%8A%E5%BE%84%E4%B8%BAr%E7%9A%84%E5%9C%86O%2CAB%3DCD%3DDE%3DF)
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