Triangle Perimeter
Math CalculatorsCalculate the perimeter of any triangle type.
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Perimeter
About This Tool
Find the perimeter of scalene, isosceles, or equilateral triangles. Enter the lengths of all three sides to get the total boundary.
Frequently Asked Questions
Since an equilateral triangle has three equal sides, its perimeter is simply $3 \times s$, where $s$ is the length of one side.
If you only know two sides, use the Pythagorean theorem ($a^2 + b^2 = c^2$) to find the third side, then add all three together.
No, the perimeter is the sum of the sides, so the order in which you enter Side A, B, or C does not change the result.
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