A polygon with 10 sides is called a decagon. The term comes from the Greek words "deka," meaning ten, and "gon," meaning angle. Decagons can be regular, with all sides and angles equal, or irregular, with varying side lengths and angles.
45
a regular shape which includes many sides possible but all sides are equeal in length
A square
square, rectangle, rhombus...
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.