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A square based pyramid is a 3-d object. It does not have a 2-d name!

Q: What is the 2d name for a square based pyramid?

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Five faces, in all.

3D = Pyramid 2D = Triangle

Yes. Just like a square is 2D.

A flat (2D) shape triangle has 3 straight edges. A triangular pyramid has 6 straight edges. A square pyramid has 8 straight edges. (Note, some vertical edges have already been counted as you move from one face to the next.)

Heptagonal pyramid * * * * * No. A heptagonal pyramid has 8 vertices. You need a hexagonal pyramid or a pentagonal dipyramid for 7 vertices. Or, in 2d, a heptagon.

Related questions

A 2D representation of a square-based pyramid is called a square pyramid net or a square pyramid template.

It is a 3 dimensional shape

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

Five faces, in all.

Neither because a) a square is 2d (so it can't be a prism) and b) a pyramid is a prism and pyramids are their own types of prisms.

4

a 2d square * * * * * A square has four sides. A side is not a face. A tetrahedron (triangular pyramid) has four faces.

The 2D polygon that has 11 vertices would be called an 11-gon. As for 3Dfigures, there are too many to name. One would be a decagon-based pyramid.

Square

No. A pyramid is a three-dimensional shape.

Pentagon 2d shape is a pentagon 3d object is a pyramid.

A prism is 3d and a pyramid is in 2d