Python program to calculate the area of a scalene triangle.
Heron's Formula
Mathematicians have known how to calculate the area of a triangle with three known sides for millennia. They use Heron's Formula, named after Hero of Alexandria. To use this formula, you first have to find the half-perimeter (s) of the triangle, which you do by adding all three sides and dividing the result by two. For a triangle with sides a, b and c, the half-perimeter s = 1/2(a + b + c). Once you know s, you calculate the area using this formula:
Area = square root [s (s - a) (s - b) (s - c)]
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