Nobody made a tetrahedron. Tetrahedral molecules, such as methane, exist in outer space and were present long before the solar system formed. There was nobody around to invent it then!
It is a tetrahedron
A regular tetrahedron
A solid figure that can be made with a net of 4 triangles is a tetrahedron. A tetrahedron consists of four triangular faces, which can be arranged in three-dimensional space to form a three-dimensional shape. Each triangle in the net corresponds to one face of the tetrahedron when folded together.
A tetrahedron must be plane faced and so, it is just an ordinary tetrahedron.
Well, a tetrahedron has four sides. A regular tetrahedron is a triangular pyramid.
It is a tetrahedron
Tetrahedron
Square Based PyramidTetrahedron: A tetrahedron is a polyhedron made of 4 triangles. A "regular tetrahedron" is a tetrahedron where the triangles are equilateral. (A polyhedron is any 3 dimentional figure made of flat surfaces and straight lines.)
Tetrahedron.
I am not a tetrahedron!
A tetrahedron has 4 vertices and 4 sides. Each side is an equilateral triangle. * * * * * Each face is an equilateral triangle only if it is a regular tetrahedron; there is no reason to assume it is.
A tetrahedron is made up of 4 triangular faces, 3 of which meet at each corner or vertex. This is sometimes called a pyramid.
a tetrahedron is made of four triangles and has 4 vertices.
A regular tetrahedron
A tetrahedron has 4 faces.
A tetrahedron must be plane faced and so, it is just an ordinary tetrahedron.
Well, a tetrahedron has four sides. A regular tetrahedron is a triangular pyramid.