Perimeter of a Triangle with Vertices Calculator

As you surely remember, the perimeter of a triangle is just the distance around its edges. To find the perimeter we need to sum the lengths of our triangle's sides.

So what is the perimeter of a triangle with vertices? This phrase refers to the problem where you don't know the lengths of the triangle's sides, but you only know the coordinates of the triangle's vertices. More calculations are then needed because we have to compute the side lengths from these coordinates. In what follows we'll show you how to do it.

Finding the perimeter of a triangle with vertices is not complicated, yet requires an intermediate step: we need to compute the length of each side. We do it using the distance formula.

Let's say our vertices are , , . Then the lengths of the sides , , , respectively, read:

Now we sum the three lengths to determine the perimeter using three vertices:

That's it! We've just determined the perimeter of a triangle with coordinates.

Our tool is really simple to use:

1. Enter the coordinates of the vertices.
2. The perimeter will be calculated immediately.
3. If you need the lengths of sides, refer to the triangle sides section of our perimeter of a triangle with vertices calculator.

Have you mastered computing the perimeter of a triangle whose vertices are known? We've got more tools related to the perimeter of triangles:

• Perimeter of a triangle;
• Perimeter of a right triangle; and
• Perimeter of a triangle with fraction.