Triangle's Vertex and Sides, Scalene Triangle, Right Triangle

This fancy ruler is an example of a scalene triangle, as well as a right triangle.

A scalene triangle is a triangle with three sides, each of different length.

A right triangle is a triangle with exactly one right angle, as seen in the top angle on this triangle.

This fancy ruler also can be used to point out a vertex of the triangle, which is any of the three red markings, and the sides of the triangle, which are marked by the yellow lines.

The vertex in a triangle is a point in a triangle.

The sides of a triangle are the lines which make up the triangle.