A polygon is a closed 2D shape with straight sides that meet at vertices. Polygons can be regular or irregular. If all the straight sides of a shape are the same length and interior angles are the ...

These events will take place cities around North America, Europe, Asia, and Australia. Polygon will continue to update this story as new details develop.

Some shapes have more than one line of symmetry. Let's look at some 2D shapes and their lines of symmetry.

279.4 x 304.8 cm. (110 x 120 in.) ...