Regular polygons are studied at the beginning of 1st year as an introduction to technical graphics. They are 2D shapes that have 3 or more sides. All the sides are equal length and all the angles are the same. The external angles of any polygon adds up to 360 degrees. Regular polygons appear in many places throughout our everyday lives (stop signs, UFC ring, hexagonal bolts, stars, footballs). These shapes can appear in many other chapters of technical graphics as part of task. The most common regular polygons studied at junior cycle are: