Q: What shapes make a tetrahedron?

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Four triangular faces.

A tetrahedron is a four sided polyhedron. Each face is a triangle. If it is a regular tetrahedron, then each face is an equilateral triangle.

There can be no formula for a tetrahedron since you have not specified what aspect the formula is supposed to calculate. Furthermore, although they are all triangular pyramids, tetrahedra can be tall, needle-like shapes or almost flat shapes.

It will look like a 2D equilateral triangle if it is a triangular based pyramid which is called a tetrahedron.

A tetrahedron (4 faces) and an icosahedron (20).

Related questions

Four triangular faces.

A tetrahedron is a four sided polyhedron. Each face is a triangle. If it is a regular tetrahedron, then each face is an equilateral triangle.

There are no other shapes that have only four flat faces except for a tetrahedron, although the faces thatmake up the tetrahedron can be triangles of various shapes and need not be all identical.

Isosceles Tetrahedron.

There can be no formula for a tetrahedron since you have not specified what aspect the formula is supposed to calculate. Furthermore, although they are all triangular pyramids, tetrahedra can be tall, needle-like shapes or almost flat shapes.

There are points (vertices) lines (edges) and polygons (faces).

Sphere, cuboid, tetrahedron.

In 2 dimensions, a quadrilateral. In 3 dimensions, a tetrahedron.

It will look like a 2D equilateral triangle if it is a triangular based pyramid which is called a tetrahedron.

Just one: a tetrahedron or triangular pyramid.

A tetrahedron (4 faces) and an icosahedron (20).

Pentagon (and in 3d: triangular prism and tetrahedron.)