Perimeter of triangle

You find the perimeter of a triangle by adding the lengths of its three sides: P = a + b + c. In an equilateral triangle all three sides are equal. In an isosceles triangle two sides are equal. In a scalene triangle all three sides are different.

What does the generator do?

The generator picks the triangle type at random (equilateral, isosceles, or scalene), generates side lengths between 2 and 20, and chooses a unit (cm, m, or mm). For isosceles and scalene triangles it makes sure that the sum of any two sides is greater than the third – so the triangle can really be drawn.

How to use it

Add up the three side lengths from the figure. For an equilateral triangle you can just multiply one side by three. Type the result into the box next to “P =” and press “Check”.