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在人教版高中数学必修5的解三角形中,提到海伦公式,S=[p(p-a)(p-b)(p-c)]~(1/2),其中p=1/[2(a+b+c)].利用它可以解决已知三角形三边直接求其面积的问题这个公式最早出现在海伦的著作《测地术》中,并在海伦的著作《测量仪器》和《度量术》中给出证明(据说这个问题最早是由古希腊数学家阿基米德解决).此公式结构简单、形式漂亮、便于记忆,堪称数学中的经典公
In the solution triangle of the PEP 5 math comprehension 5, the Helen formula is mentioned, S = [p (pa) (pb) (pc)] ~ (1/2), where p = 1 / [2 + c)]. It can be used to solve the problem of finding the area directly on three sides of a known triangle. This formula first appeared in Helen's book “Geodesy” and in Helen's book “Measuring Instruments” and “Metrology” Give proof (it is said that this problem was first solved by the ancient Greek mathematician Archimedes.) This formula is simple in structure, beautiful in form, easy to remember, called the classic mathematics