求三角形ACF的面积如图,点D是⊙O的直径CA延长线上一点,点B在⊙O上,且∠DBA=∠BCD.(1)根据你的判断:BD是⊙O的切线吗?为什么?.(2)若点E是劣弧BC上一点,AE与BC相交于点F,且△BEF的面积为10,c
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![求三角形ACF的面积如图,点D是⊙O的直径CA延长线上一点,点B在⊙O上,且∠DBA=∠BCD.(1)根据你的判断:BD是⊙O的切线吗?为什么?.(2)若点E是劣弧BC上一点,AE与BC相交于点F,且△BEF的面积为10,c](/uploads/image/z/10220226-42-6.jpg?t=%E6%B1%82%E4%B8%89%E8%A7%92%E5%BD%A2ACF%E7%9A%84%E9%9D%A2%E7%A7%AF%E5%A6%82%E5%9B%BE%2C%E7%82%B9D%E6%98%AF%E2%8A%99O%E7%9A%84%E7%9B%B4%E5%BE%84CA%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E7%82%B9B%E5%9C%A8%E2%8A%99O%E4%B8%8A%2C%E4%B8%94%E2%88%A0DBA%3D%E2%88%A0BCD%EF%BC%8E%EF%BC%881%EF%BC%89%E6%A0%B9%E6%8D%AE%E4%BD%A0%E7%9A%84%E5%88%A4%E6%96%AD%EF%BC%9ABD%E6%98%AF%E2%8A%99O%E7%9A%84%E5%88%87%E7%BA%BF%E5%90%97%3F%E4%B8%BA%E4%BB%80%E4%B9%88%3F%EF%BC%8E%EF%BC%882%EF%BC%89%E8%8B%A5%E7%82%B9E%E6%98%AF%E5%8A%A3%E5%BC%A7BC%E4%B8%8A%E4%B8%80%E7%82%B9%2CAE%E4%B8%8EBC%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9F%2C%E4%B8%94%E2%96%B3BEF%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BA10%2Cc)
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