如图,三角形ABC内接于圆O,AD平分角BAC交圆O于D,DE垂直AB于E1.求证AE=AC+BE 2.若BE=AC=2,sin角BAD=2/5根号5,求圆O的半径
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![如图,三角形ABC内接于圆O,AD平分角BAC交圆O于D,DE垂直AB于E1.求证AE=AC+BE 2.若BE=AC=2,sin角BAD=2/5根号5,求圆O的半径](/uploads/image/z/14271467-59-7.jpg?t=%E5%A6%82%E5%9B%BE%2C%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E5%86%85%E6%8E%A5%E4%BA%8E%E5%9C%86O%2CAD%E5%B9%B3%E5%88%86%E8%A7%92BAC%E4%BA%A4%E5%9C%86O%E4%BA%8ED%2CDE%E5%9E%82%E7%9B%B4AB%E4%BA%8EE1.%E6%B1%82%E8%AF%81AE%3DAC%2BBE+2.%E8%8B%A5BE%3DAC%3D2%2Csin%E8%A7%92BAD%3D2%2F5%E6%A0%B9%E5%8F%B75%2C%E6%B1%82%E5%9C%86O%E7%9A%84%E5%8D%8A%E5%BE%84)
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