Q: What is a polyhedron that has a base of a triangle?

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A regular polyhedron has equal size faces as in the case of a tetrahedron which is a triangular base pyramid that has 4 equilateral triangle faces.

A pyramid seems to fit the description.

The answer is a polyhedron

square and hexagon

it is a triangle prism

Related questions

A tetrahedron, a triangle based pyramid, an octahedron, an icosahedron plus many more.

Tetrahedron - a pyramid with a triangular base.

A triangle is not a polyhedron. A triangle is a two-dimensional figure, and a polyhedron is a three-dimensional solid. An example of a triangular-shaped polyhedron is a pyramid.

A regular polyhedron has equal size faces as in the case of a tetrahedron which is a triangular base pyramid that has 4 equilateral triangle faces.

A pyramid seems to fit the description.

A polyhedron is a 3-dimensional object comprising a space enclosed by a number of polygons. In general, these polygons are called faces: in some polyhedra they are also called bases. They may or may not be triangular. A pentagonal prism, for example, has no triangle face and so no triangular base.

The answer is a polyhedron

square and hexagon

it is a triangle prism

Yes. A base on a polyhedron is a face and a base on a polygon is a side.

Yes

pyramid