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a regular shape which includes many sides possible but all sides are equeal in length
square, rectangle, rhombus...
A square
A hexagon.
A hexagon is a poloygon.
rhombus, square, rectangle, kite, parallelogram, trapezium (U.K.) trapezoid (U.S.)
For a Polygon, "Poly" means "many" or "a number of"; "gon", roughly means "angles". So a poloygon is a figure with a number of angles between its sides. . If the number of sides is definite then "poly" is replaced by a word meaning that number.
Decagon(10 sides polygon).
A nonagon.
A Pentagon
You must be talking about a rhombus.In a rhombus, all four sides are congruent, opposite angles are congruent, and opposing sides are parallel. Rectangles, squares, and kites must be rhombi, and rhombi must be parallelograms, quadrilaterals, and polygons.