三角形ABC,AC为18,D为AC上一点,AD为5,D到AB,BC两边的距离分别为4和5,求三角形ABC面积很明显,这不是个直角三角形.
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![三角形ABC,AC为18,D为AC上一点,AD为5,D到AB,BC两边的距离分别为4和5,求三角形ABC面积很明显,这不是个直角三角形.](/uploads/image/z/5248611-27-1.jpg?t=%E4%B8%89%E8%A7%92%E5%BD%A2ABC%2CAC%E4%B8%BA18%2CD%E4%B8%BAAC%E4%B8%8A%E4%B8%80%E7%82%B9%2CAD%E4%B8%BA5%2CD%E5%88%B0AB%2CBC%E4%B8%A4%E8%BE%B9%E7%9A%84%E8%B7%9D%E7%A6%BB%E5%88%86%E5%88%AB%E4%B8%BA4%E5%92%8C5%2C%E6%B1%82%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E9%9D%A2%E7%A7%AF%E5%BE%88%E6%98%8E%E6%98%BE%2C%E8%BF%99%E4%B8%8D%E6%98%AF%E4%B8%AA%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2.)
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