Imagine a pyramid, with a triangle shaped base, with three sides coming up each of which is a triangle. That is a tetrahedron (4 sides, all the same side, with each one the shape of a triangle).
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Mostly correct, but the four faces need not all be the same.
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A tetrahedron is 3-dimensional and so it looks just like an ordinary tetrahedron.
It will look like a 2D equilateral triangle if it is a triangular based pyramid which is called a tetrahedron.
Well, a tetrahedron has four sides. A regular tetrahedron is a triangular pyramid.
A tetrahedron must be plane faced and so, it is just an ordinary tetrahedron.
A Tetrahedron. The most common form of a tetrahedron is called a regular tetrahedron, or a pyramid