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许多人计算三角形的面积时,用的是它的高及与之相对的底的长度.如果没有海伦公式,只知道三角形三条边的长度而要求它的面积,就需要三角学的知识.海伦因下面的公式而在数学上青史留名:
Many people calculate the area of a triangle by its height and the length of the base opposite it. Without the Helenian formula, knowing the length of the three sides of a triangle and requiring its area requires the knowledge of trigonometry. The following formula in the history of mathematics after the famous: