COMES IN *THREE* / Book, letterpress+laser print

1 A *tri*angle is one of the basic shapes of geometry: a polygon with *three* corners or vertices and *three* sides or edges which are line segments.

2 Right Angled *Tri*angle

Obtuse *Tri*angle

Acute *Tri*angle

3 The *three* dimensions are commonly called length, width, and depth (or height), although any *three* directions can be chosen, provided that they do not lie in the same plane. *Three*-dimensional space is a geometric model of the physical universe in which we live