- See also changes related to Triangle, or pages that link to Triangle or to this page or whose text .
- Geometry : The mathematics of spacial concepts.
- : A triangle with three equal sides and three equal angles.
- : A triangle that has two sides of equal length and two angles of the same degree.
- : A triangle that has one angle which is greater than 90 degrees.
- : A triangle that has all three angles less than 90 degrees.
- : A triangle that has one 90 degree angle.