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题一个三角形的三边长分别是2~(1/2)cm,5~(1/2)cm和1cm,求它的面积.分析已知三角形三边求面积,可用海伦公式或秦九韶公式。但我发现了一个更巧妙的方法.
The trilateral length of a triangle is 2~(1/2)cm, 5~(1/2)cm and 1cm, respectively. Find the area of the triangle. Analyze the three sides of the known triangle to find the area. Use Helen’s formula or Qin Jiuxuan’s formula. But I found a more clever way.