等边△ABC的三个顶点A,B,C分别在⊙O上,连接OA,OB,OC,延长AB,分别交BC于点P,交弧BC于点D,连接BD,CD.(1)判断四边形BDCO是哪种特殊的四边形,并说明理由.(2)若⊙O的半径为r,求等边△ABC的边长.
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![等边△ABC的三个顶点A,B,C分别在⊙O上,连接OA,OB,OC,延长AB,分别交BC于点P,交弧BC于点D,连接BD,CD.(1)判断四边形BDCO是哪种特殊的四边形,并说明理由.(2)若⊙O的半径为r,求等边△ABC的边长.](/uploads/image/z/10155817-1-7.jpg?t=%E7%AD%89%E8%BE%B9%E2%96%B3ABC%E7%9A%84%E4%B8%89%E4%B8%AA%E9%A1%B6%E7%82%B9A%2CB%2CC%E5%88%86%E5%88%AB%E5%9C%A8%E2%8A%99O%E4%B8%8A%2C%E8%BF%9E%E6%8E%A5OA%2COB%2COC%2C%E5%BB%B6%E9%95%BFAB%2C%E5%88%86%E5%88%AB%E4%BA%A4BC%E4%BA%8E%E7%82%B9P%2C%E4%BA%A4%E5%BC%A7BC%E4%BA%8E%E7%82%B9D%2C%E8%BF%9E%E6%8E%A5BD%2CCD.%EF%BC%881%EF%BC%89%E5%88%A4%E6%96%AD%E5%9B%9B%E8%BE%B9%E5%BD%A2BDCO%E6%98%AF%E5%93%AA%E7%A7%8D%E7%89%B9%E6%AE%8A%E7%9A%84%E5%9B%9B%E8%BE%B9%E5%BD%A2%2C%E5%B9%B6%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1.%EF%BC%882%EF%BC%89%E8%8B%A5%E2%8A%99O%E7%9A%84%E5%8D%8A%E5%BE%84%E4%B8%BAr%2C%E6%B1%82%E7%AD%89%E8%BE%B9%E2%96%B3ABC%E7%9A%84%E8%BE%B9%E9%95%BF.)
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