a triangle
No it is not.
It is a square with four trianglescoming out from each sides. In general, this will be like a four-pointed star.
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It is a 3 dimensional shape
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.
a pyramid is a 3D shape :)
No. A pyramid is a three-dimensional shape.
It's a 2D shape.