Penta means five and gon means figures with definite angle and edges , so Pentagon means figure with 5 edges , vertex and angles . So Pentagon has 5 sides.

Introduction:
A pentagon is a geometric shape that belongs to the category of polygons. It is a two-dimensional figure that consists of five straight sides and five angles. In this response, we will explore the characteristics and properties of a pentagon in detail.

Definition and Shape:
A pentagon is defined as a polygon with five sides. The word "pentagon" is derived from the Greek words "pente" meaning "five" and "gonia" meaning "angle." It is a closed figure formed by joining five line segments together, with each segment intersecting two others. The shape of a pentagon can vary, as long as it maintains the requirement of having five sides and five angles.

Properties of a Pentagon:
1. Number of Sides: A pentagon has precisely five sides. Each side is a straight line segment that connects two vertices of the pentagon.
2. Length of Sides: The length of the sides of a pentagon may vary. However, in a regular pentagon, all sides are equal in length.
3. Sum of Interior Angles: The sum of the interior angles of any polygon can be calculated using the formula (n-2) * 180 degrees, where "n" represents the number of sides. For a pentagon, this formula gives us (5-2) * 180 = 540 degrees.
4. Angle Measure: In a regular pentagon, all interior angles are equal. Therefore, each angle within a regular pentagon measures 108 degrees. In an irregular pentagon, the angles may have different measures.
5. Diagonals: Diagonals are line segments that connect any two non-adjacent vertices of a polygon. A pentagon has five diagonals, connecting different combinations of vertices.

Visual Representation:
To better understand the concept, here is a visual representation of a regular pentagon:

[insert a visually appealing image of a regular pentagon]

Conclusion:
In conclusion, a pentagon is a polygon with five sides and five angles. It is a closed figure that can have different shapes while maintaining the requirement of five sides. The properties of a pentagon include the number and length of sides, the sum and measure of interior angles, and the presence of diagonals. Understanding these characteristics helps in identifying and studying pentagons in various mathematical and practical applications.