# Polygons

**Topics:**Polygon, Regular polygon, Polygons

**Pages:**3 (420 words)

**Published:**February 28, 2013

A closed plane figure made up of several line segments that are joined together. The sides do not cross each other. Exactly two sides meet at every vertex. Types of Polygons

Regular - all angles are equal and all sides are the same length. Regular polygons are both equiangular and equilateral. Equiangular - all angles are equal.

Equilateral - all sides are the same length.

| Convex - a straight line drawn through a convex polygoncrosses at most two sides. Every interior angle is less than 180°.| | Concave - you can draw at least one straight line through a concave polygon that crosses more than two sides. At least one interior angle is more than 180°.| Polygon Formulas

(N = # of sides and S = length from center to a corner)

Area of a regular polygon = (1/2) N sin(360°/N) S2

Sum of the interior angles of a polygon = (N - 2) x 180°

The number of diagonals in a polygon = 1/2 N(N-3)

The number of triangles (when you draw all the diagonals from one vertex) in a polygon = (N - 2)

Polygon Parts

| Side - one of the line segments that make up the polygon.Vertex - point where two sides meet. Two or more of these points are called vertices.Diagonal - a line connecting two vertices that isn't a side.Interior Angle - Angle formed by two adjacent sides inside the polygon.Exterior Angle - Angle formed by two adjacent sides outside the polygon.| Special Polygons

Special Quadrilaterals - square, rhombus, parallelogram, rectangle, and the trapezoid. Special Triangles - right, equilateral, isosceles, scalene, acute, obtuse. Polygon Names

Generally accepted names

Sides| Name|

n| N-gon|

3| Triangle|

4| Quadrilateral|

5| Pentagon|

6| Hexagon|

7| Heptagon|

8| Octagon|

10| Decagon|

12| Dodecagon|

Names for other polygons have been proposed.

Sides| Name|

9| Nonagon, Enneagon|

11| Undecagon, Hendecagon|

13| Tridecagon, Triskaidecagon|

14| Tetradecagon, Tetrakaidecagon|

15|...

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