- A regular tetrahedron is a tetrahedron in which all four faces are equilateral triangles. In other words, all of its faces are the same size and shape (congruent) and all edges are the same length. A convex polyhedron in which all of its faces are equilateral triangles is the deltahedron. There are eight convex deltahedra, one of which is the regular tetrahedron.
- Clallam County, Washington (data.census.gov)
Clallam County, Washington has 1,738.8 square miles of land area and is the 20th largest county in Washington by total area. Clallam County, Washington is bordered by Jefferson County, Washington and San Juan County, Washington.