Right triangle definition - Math Open Reference (original) (raw)

A triangle where one of its interior angles is a right angle (90 degrees).

Try this Drag the orange dots on each vertex to reshape the triangle. Notice it always remains a right triangle, because the angle ∠ABC is always 90 degrees.

You can construct right triangles with compass and straightedge given various combinations of sides and angles. For a complete list see Constructions - Table of Contents.