Assuming that a match is one unit of length, it is possible to place 12 matches on a plane in various ways to form polygons with areas that have integral values. On this page are two such polygons: a ...

The Missing Square Puzzle shows our rendition of a popular geometric conundrum. First, you see a right triangle made of four distinct shapes. Then, these are moved around to fit into the same triangle ...

Two-dimensional (2D) shapes are completely flat. They cannot be picked up. A polygon is a 2D shape with straight sides that meet at vertices. Polygons have names that show the number of sides they ...