Polygon
Polygon
A Polygon is a plane figure that is described by a finite number of straight line segments connected to form a closed polygonal chain or polygonal circuit. The solid plane region, the bounding circuit, or the two together, may be called a polygon.
The segments of a polygonal circuit are called its edges or sides, and the points where two edges meet are the polygon's vertices (singular: vertex) or corners. The interior of a solid polygon is sometimes called its body. An n-gon is a polygon with n sides; for example, a triangle is a 3-gon.
A simple polygon is one which does not intersect itself. Polygons may be characterized by their convexity or type of non-convexity:
- Convex: any line drawn through the polygon (and not tangent to an edge or corner) meets its boundary exactly twice. As a consequence, all its interior angles are less than 180°.
- Non-convex: a line may be found which meets its boundary more than twice, and the interior angle can be greater than 180°.
Types of Polygons[edit]
Polygons are primarily classified by the number of sides. Polygons with three through twenty and higher numbers of sides have specific names, for example:
- Triangle (more details): A polygon with three sides.
- Quadrilateral (more details): A polygon with four sides.
- Pentagon (more details): A polygon with five sides.
- Hexagon (more details): A polygon with six sides.
- Heptagon (more details): A polygon with seven sides.
- Octagon (more details): A polygon with eight sides.
- Nonagon (more details): A polygon with nine sides.
- Decagon (more details): A polygon with ten sides.
Properties of Polygons[edit]
Polygons have several properties, including:
- Interior Angles (more details): The sum of the measures of the interior angles of a polygon with n sides is (n − 2) × 180°.
- Exterior Angles (more details): The sum of the measures of the exterior angles of a polygon is 360°.
- Area (more details): The area of a polygon can be computed in various ways depending on the type of the polygon.
See Also[edit]
References[edit]
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