A square pyramid.
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The three pyramids that i know of is a :) Triangular based pyramid :) Square based pyramid :) Hexagonal based pyramid
A square based pyramid has 5 corners - 4 for the square and 1 for the top of the pyramid.
A square based pyramid.
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.
I don't know not mine