simplex
generalization of the notion of a triangle or tetrahedron to arbitrary dimensions
vertex
special kind of point that describes the corners or intersections of geometric shapes
equilateral triangle
geometric shape with three sides of equal length
triangle
basic three-sided shape of geometry
acute or obtuse triangle
triangle without a right angle
Thoma simplex
simplex named after Elmar Thoma
tetrahedron
four-sided polyhedron
regular tetrahedron
Platonic solid