Triangle Perimeter Calculator

Calculate the perimeter of a triangle using different methods.

a b c
12.00
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How to Calculate Triangle Perimeter

The perimeter of a triangle is the sum of all three sides. For a triangle with sides a, b, and c, the perimeter formula is:

P = a + b + c

Triangle Inequality Theorem

For a triangle to exist, the sum of any two sides must be greater than the third side. This means:

  • a + b > c
  • b + c > a
  • a + c > b