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A cone
5 edges, 5 verts, and faces are only on 3d shapes, for the most part, so any 2d shape has 1
A major sector of a curve.
It could be a kite or an irregular quadrdilateral with one right angle - which would not have any specific name.
A point isn't a shape. It's a 1 dimensional marker that combined with multiple other markers can make 2D and 3D objects. So as it's not a shape it doesn't have any size. Yes the dot itself have a shape but your using it to represent something that does not have a shape.