如图,在三角形ABC中,角ACB为90度,E为BC上的一点,以CE为直径作圆O,AB与圆O相切于点D,连接CD,若BE等于OE等于2那么角A为多少度?图中阴影部分的面积为多少?
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![如图,在三角形ABC中,角ACB为90度,E为BC上的一点,以CE为直径作圆O,AB与圆O相切于点D,连接CD,若BE等于OE等于2那么角A为多少度?图中阴影部分的面积为多少?](/uploads/image/z/7165082-2-2.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E8%A7%92ACB%E4%B8%BA90%E5%BA%A6%2CE%E4%B8%BABC%E4%B8%8A%E7%9A%84%E4%B8%80%E7%82%B9%2C%E4%BB%A5CE%E4%B8%BA%E7%9B%B4%E5%BE%84%E4%BD%9C%E5%9C%86O%2CAB%E4%B8%8E%E5%9C%86O%E7%9B%B8%E5%88%87%E4%BA%8E%E7%82%B9D%2C%E8%BF%9E%E6%8E%A5CD%2C%E8%8B%A5BE%E7%AD%89%E4%BA%8EOE%E7%AD%89%E4%BA%8E2%E9%82%A3%E4%B9%88%E8%A7%92A%E4%B8%BA%E5%A4%9A%E5%B0%91%E5%BA%A6%3F%E5%9B%BE%E4%B8%AD%E9%98%B4%E5%BD%B1%E9%83%A8%E5%88%86%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BA%E5%A4%9A%E5%B0%91%3F)
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