Explore the properties of 2D shapes from one-sided circles to the eight-sided octagons. Shapes with 3 sides Explore shapes with 3 sides and look at curved and straight lines. Shapes with 4 sides ...

Then work through the page and see if you can beat your score. 2D shapes have sides and corners. Another name for a corner is a vertex. A vertex is a point where two or more lines meet.