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Q: What is a three dimensional figure that has a base of a triangle?

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pyramid

It could be a pyramid.

A hemisphere is one example.

Cone

It is simply called a face.

Related questions

A tetrahedron is a three-dimensional figure with four equilateral triangles. Every pyramid with a triangle as the base is a tetrahedron.

A three dimensional triangular figure with three faces and a base is called a triangular pyramid. It has four vertices, four faces, and six edges.

Because the base of a cone is round, it is the only three dimensional figure with only one vertex.

pyramid

triangle

pyramid or cone

It could be a pyramid.

It can be a triangular based pyramid

It is simply called a face.

A hemisphere is one example.

Cone

There is no such thing as a 3-dimensional triangle. A triangle is a 2-dimensional figure. So, depending on what you mean exactly, the volume can vary. In the case of a pyramid - whether it has a triangular base, a rectangular base, or any other base - the volume is (1/3) Bh, that is, 1/3 times the area of the base times the perpendicular height.

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