- 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.
- Meadowbrook, Seattle (Wikipedia)
Meadowbrook is a neighborhood in the Lake City district (township annexed in 1954) of Seattle, Washington. Meadowbrook is centered on open fields adjacent to the Community Center, Meadowbrook swimming pool, and Nathan Hale High School. It is bounded on the south by NE 95th Street and the Wedgwood neighborhood, on the north by NE 120th Street and Cedar Park, on the west by Lake City Way NE (State Route 522) and Victory Heights, and on the east by 35th Avenue NE and Matthews Beach.