A tetrahedron, or triangular pyramid, is a polyhedron consisting of 4 triangles between 4 vertices. A tetrahedron splits the euclidean space in two by the plane defined by the first 3 vertices and the positive side being the side that includes the fourth vertex. If a all 4 vertices are coplanar the tetrahedron is considered degenerate. Tetrahedrons only exists in 3 dimensions.

```
tetrahedron(...)
is_tetrahedron(x)
as_tetrahedron(x)
```

- ...
Various input. See the Constructor section.

- x
A vector of tetrahedrons or an object to convert to it

An `euclid_tetrahedron`

vector

**3 dimensional tetrahedrons**

Providing four points will construct tetrahedrons in the order the points are given.