what is the pentagon
In geometry, a pentagon (from the Greek ÏÎ­Î½ÏÎµ pente and Î³ÏÎ½Î¯Î± gonia, meaning five and angle) is any five-sided polygon or 5-gon. The sum of the internal angles in a simple pentagon is 540Â°. A pentagon may be simple or self-intersecting. A self-intersecting regular pentagon (or star pentagon) is called a pentagram.