2D Shapes
Regular Polygons
A polygon is a plane (2D) shape with straight sides.
To be a regular polygon all the sides and angles must be the
same:
 Triangle - 3 Sides |
 Square - 4 Sides |
 Pentagon - 5 Sides |
 Hexagon - 6 sides |
 Heptagon - 7 Sides |
 Octagon - 8 Sides |
 Nonagon - 9 Sides |
 Decagon - 10 Sides |
| More ... | |
Other Common Polygons
These are 2D shapes, and they are polygons, but not regular polygons:
 Quadrilateral Any 4 sided 2D shape |
 Rectangle - 4 Sides All right angles |
| And many more! | |
Curved Shapes
These are also 2D shapes, but are not polygons because they have curves:
 Circle |
 Ellipse |
| And many more! | |