You cannot have a 2d pyramid - whether or not it is square based. The 2d cross section will depend on the plane of the cross section.
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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.
It is NEITHER. A SQUARE is a PLAIN 2-dimensional figure . A PRISM & a PYRAMID are 3-dimensional objects.
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.
No. A pyramid is a three-dimensional shape.