triangle in which all three sides have the same length. In the familiar Euclidean geometry, an equilateral triangle is also equiangular; that is, all three internal angles are also congruent to each other and are each 60°. It is also a regular polygon, so it is also referred to as a regular triangle.- Regular tetrahedron (Wikipedia)
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.
- Book of Exodus (Wikipedia)
The Book of Exodus (from Ancient Greek: Ἔξοδος, romanized: Éxodos; Biblical Hebrew: שְׁמוֹת Šəmōṯ, ‘Names’; Latin: Liber Exodus) is the second book of the Bible. It is a narrative of the Exodus, the origin myth of the Israelites leaving slavery in Biblical Egypt through the strength of their deity named Yahweh, who according to the story chose them as his people. The Israelites then journey with the legendary prophet Moses to Mount Sinai, where Yahweh gives the 10 commandments and they enter into a covenant with Yahweh, who promises to make them a “holy nation, and a kingdom of priests” on condition of their faithfulness. He gives them their laws and instructions to build the Tabernacle, the means by which he will come from heaven and dwell with them and lead them in a holy war to conquer Canaan (the “Promised Land”), which has earlier, according to the myth of Genesis, been promised to the “seed” of Abraham, the legendary patriarch of the Israelites.