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In this code, the area of ​​each triangular surface of the 3D surface is calculated by Heron's formula.
This formula helps you find the area of ​​the surface with the side lengths of the given triangle.
Heron's Formula:
If the side lengths of a triangle are aa, bb and cc, the area AA is calculated as follows:
Here, ss is the half perimeter of the triangle and is calculated as follows:
