The word pentagon is defined as a polygon with five sides and five angles. It is one of the most recognizable shapes in geometry, and it can be found in many everyday objects such as stop signs, flags, buildings, coins, and even toys. The pentagon has been around since ancient times when it was used to represent the human body or nature’s elements like earth or water.

In mathematics specifically geometry class you will learn more about its properties such as how all of its sides have an equal length which means that all angles are also equal at 108 degrees making them regular polygons. Additionally, there are several formulas associated with this shape including the area formula A=1/2ab sin “c” where “a” & “b” refer to two adjacent side lengths while “C” refers angle between those two sides; the perimeter formula P = 5s where s stands for any side length; interior angle sum IAS = 540°; exterior angle sum EAS = 360°.

The Pentagon building located near Washington Dc has nothing related to these mathematical concepts but instead got its name from being shaped like a pentagon itself! This iconic structure houses offices for the United States Department of Defense along with other military departments making it an important part of our nation’s history too!