Regular tetrahedron
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A regular tetrahedron is a polyhedron with four equilateral triangular faces.
Regular tetrahedron, representing the classical element of fire, sketched by Johannes Kepler.
Kepler's Platonic solid model of the Solar System
Tetrahedron
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In geometry, a tetrahedron, also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertices. The tetrahedron is the simplest of all the ord
Regular tetrahedron
…A regular tetrahedron is a polyhedron with four equilateral triangular faces. A regular tetrahedron is a tetrahedron (that is, a four-sided polyhedron) in which all four faces are equilateral triangles. In other words, all of its faces are the same size and shape…
A caltrop
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