Triangle: 3 sides
Quadrilateral: 4 sides
Pentagon: 5 sides
Hexagon: 6 sides
Heptagon: 7 sides
Octagon: 8 sides
Nonagon: 9 sides
Decagon: 10 sides
And there are many more
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All regular polygons with an even number of sides. Also rectangles.All regular polygons with an even number of sides. Also rectangles.All regular polygons with an even number of sides. Also rectangles.All regular polygons with an even number of sides. Also rectangles.
The answer depends on what attributes you want to use for classification. These could be:number of sides (vertices),whether or not all sides are equal,whether or not all angles are equal,whether or not all sides and angles are equal (regular),number of parallel sides,number of perpendicular sides,order of rotational symmetry,number of lines of symmetry,convex or concave,various combinations of the above.
For regular polygons: 3, 4, or 6. For irregular polygons, figures with any number of sides can be found.
For the simple reasons that polygons are named after the number of sides, and the Greek prefix "icosa" means twenty!For the simple reasons that polygons are named after the number of sides, and the Greek prefix "icosa" means twenty!For the simple reasons that polygons are named after the number of sides, and the Greek prefix "icosa" means twenty!For the simple reasons that polygons are named after the number of sides, and the Greek prefix "icosa" means twenty!
All polygons have an equal number of sides and angles.