Helen formula has also been translated into Helen formula, Hailong formula, Hero formula and Helen-Qin formula. It is a formula for directly calculating the area of a triangle by using the side lengths of three sides of the triangle. The expression is: S=√p(p-a)(p-b)(p-c).
This formula was put forward by Archimedes, but people named it after the ancient Greek mathematician Helen, because it first appeared in Helen's book Geodesy and was proved in Helen's book Measuring Instruments and Metrology. Helen formula provides a new method and idea for calculating the area of triangles and polygons. When the lengths of three sides of a triangle are known but their heights are not known, the area can be calculated more quickly and simply by using Helen formula.
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