How do you calculate the perimeter of a triangle?

To calculate the perimeter of a triangle, you take the sum of the lengths of all three sides. This method applies to any polygon, but for a triangle specifically, you would identify the measurements of each side and simply add them together. The formula for the perimeter (P) of a triangle would be represented as:

P = side1 + side2 + side3

This straightforward addition gives you the total distance around the triangle, which is the definition of perimeter. The other methods presented, such as multiplying or dividing the sides, or subtracting the longest side, do not yield the correct measurement for the perimeter and do not align with the mathematical definition of what perimeter is.