如图,三角形ABC是直角三角形,AB是圆的直径,且AB=20厘米,阴影(1)面积比阴影(2)面积大7平方厘米,求BC长.
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![如图,三角形ABC是直角三角形,AB是圆的直径,且AB=20厘米,阴影(1)面积比阴影(2)面积大7平方厘米,求BC长.](/uploads/image/z/818939-11-9.jpg?t=%E5%A6%82%E5%9B%BE%2C%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E6%98%AF%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%2CAB%E6%98%AF%E5%9C%86%E7%9A%84%E7%9B%B4%E5%BE%84%2C%E4%B8%94AB%3D20%E5%8E%98%E7%B1%B3%2C%E9%98%B4%E5%BD%B1%EF%BC%881%EF%BC%89%E9%9D%A2%E7%A7%AF%E6%AF%94%E9%98%B4%E5%BD%B1%EF%BC%882%EF%BC%89%E9%9D%A2%E7%A7%AF%E5%A4%A77%E5%B9%B3%E6%96%B9%E5%8E%98%E7%B1%B3%2C%E6%B1%82BC%E9%95%BF.)
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