Perimeter of Triangle

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Theorem

Let $ABC$ be a triangle.

Then the perimeter $P$ of $ABC$ is given by:

$P = a + b + c$

where $a, b, c$ are the lengths of the sides of $ABC$.


Proof

The perimeter of a plane geometric figure is defined as the total length of the boundary.

By definition, the boundary of a triangle comprises the three sides of that triangle.

Hence the result.

$\blacksquare$


Sources