By A Mystery Man Writer
A triangle is a 3-sided polygon sometimes (but not very commonly) called the trigon. Every triangle has three sides and three angles, some of which may be the same. The sides of a triangle are given special names in the case of a right triangle, with the side opposite the right angle being termed the hypotenuse and the other two sides being known as the legs. All triangles are convex and bicentric. That portion of the plane enclosed by the triangle is called the triangle interior, while the
Inner Napoleon Triangle -- from Wolfram MathWorld
code golf - Draw A Reuleaux Triangle! - Code Golf Stack Exchange
NagelPoint Wolfram Function Repository
Triangle - Alchetron, The Free Social Encyclopedia
Schoute Center -- from Wolfram MathWorld
Circumcevian Triangle -- from Wolfram MathWorld
Obtuse Triangle -- from Wolfram MathWorld
Euler's Number Triangle -- from Wolfram MathWorld
Fourier Series -- from Wolfram MathWorld
First Neuberg Triangle -- from Wolfram MathWorld
Diagonal Triangle -- from Wolfram MathWorld
Octahedron -- from Wolfram MathWorld