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By definition, a polygon has to have at least three sides.
3. Triangle
4. Square or Quadrilateral
5. Pentagon
6. Hexagon
7. Heptagon
8. Octagon
9. Nonagon or Ennagon
10. Decagon
11. Hendecagon or Undecagon
12. Dodecagon
13. Triskaidecagon
14. Tetrakaidecagon
15. Pendedecagon
16. Hexdecagon
17. Heptdecagon
18. Octdecagon
19. Enneadecagon
20. Icosagon
Quadrilaterals are polygons with four sides. Triangles are polygons with three sides.
It could be a trapezium, or polygons from 5 to 13 sides. It could be a trapezium, or polygons from 5 to 13 sides. It could be a trapezium, or polygons from 5 to 13 sides. It could be a trapezium, or polygons from 5 to 13 sides.
two polygons with sides that have all equal sides and angles
Convex polygons with congruent sides and congruent angles are called regular polygons.
Some polygons have 5 sides, others have more or fewer. A polygon with 5 sides is a pentagon.