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 ...

Polygons can be regular or irregular in shape. A polygon is a closed 2D shape with at least three sides. A regular polygon ... This gives 8 × 180 = 1440. The interior angles in a decagon sum ...