I can't answer this question as I am not in the same math class as you are.
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The answer depends on what is being measured: the perimeter, area, lengths of diagonals, individual angles, sum of angles, etc. Some of these have simple formulae other don't.
A square is a regular four-sided polygon.
A four-sided polygon has two diagonals.
A hexagon is a six-sided polygon. A four-sided polygon is a quadrilateral, quadrangle, or tetragon.
The area of a four-sided polygon is base times height.
The name of a 12 sided polygon is dodecagon.