Shapes can have an infinite number of sides, but one example with a large number of sides is the googolgon, which has 10^{100} sides. Other examples of shapes with a large number of sides include the chiliagon (1,000), myriagon (10,000) and megagon (1,000,000).

A two-dimensional shape consisting of a set of closed straight lines is called a polygon. The word "polygon" comes from the Greek and means "many angles." Common polygons include the triangle, square, rectangle, pentagon and octagon. Polygons which have equal sides and angles are called "regular polygons." For example, each angle of a regular googolgon equals approximately 180 degrees, while those of a hexagon with six sides equal 120 degrees. A polygon can also be simple or complex. Simple polygons have sides that do not cross each other, while the sides of complex polygons intersect.