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Ellipses are a scientific word for the shape of an oval. for example the planets orbits are ellipses.
A common polygon with five vertices is the pentagon. A common three dimensional shape with five vertices is the square pyramid.
A 1 dimensional shape is a line.
The net of a 2 dimensional shape can be folded into a 3 dimensional shape
the difference between a two dimensional shape and and a solid is that a two dimensional shape is plane and a solid you can see the whole shape a the inside.