what shape has 5 sides

A shape with 5 sides is called a pentagon. A pentagon is a two-dimensional polygon with five straight sides and five interior angles, which add up to 540°. The word "pentagon" is derived from the Greek words "penta," meaning five, and "gon," meaning angles. If all five sides are equal in length and all five angles have an equal measure, then the shape is called a regular pentagon. If the sides and angles are not equal, it is called an irregular pentagon. The sum of all the interior angles in any pentagon is 540°. A pentagon has five diagonals connecting the five vertices to their opposite vertices. In a regular pentagon, each interior angle measures 108°, and each exterior angle measures 72°. The perimeter of a regular pentagon equals (5 x side) units if all the sides have the same measurement.