Interior and Exterior of a Closed Curve
Interior:
- The interior of a closed curve refers to the region enclosed by the curve itself.
- It is the area inside the curve where points lie.
- Points within the closed curve are considered part of the interior.
Exterior:
- The exterior of a closed curve refers to the region outside the curve.
- It is the area outside the curve where points do not lie.
- Points outside the closed curve are considered part of the exterior.

Polygons
Definition:
- Polygons are 2-dimensional shapes made up of straight lines that are connected to form a closed figure.
- They are classified by the number of sides they have, such as triangles, quadrilaterals, pentagons, etc.
Properties:
- Polygons have interior angles that add up to a specific sum depending on the number of sides.
- They have exterior angles that are supplementary to the interior angles.
- The sum of the exterior angles of any polygon is always 360 degrees.
Types:
- Regular polygons have all sides and angles equal.
- Irregular polygons have sides and angles of different lengths and measures.
Applications:
- Polygons are commonly used in geometry to calculate areas and perimeters of shapes.
- They are used in architecture, design, and engineering for creating various structures and patterns.

What are polygons?

A simple closed curve made up of only line segments is called a polygon.