Polygons by Amy Pihlainen Polygons The word polygon

Polygons by Amy Pihlainen

Polygons • The word polygon means “many angles” • A two dimensional object • A closed figure

More about Polygons • Made up of three or more straight line segments • There are exactly two sides that meet at a vertex • The sides do not cross each other

Examples of Polygons

These are not Polygons

Terms: Side: One of the line segments that make up a polygon. Vertex: point where two sides meet.

Terms continued • Interior angle: an angle formed by two adjacent sides inside the polygon. • Exterior angle: an angle formed by two adjacent sides outside the polygon.

Terms continued

Types of Polygons • Equiangular Polygon: a polygon in which all of the angles are equal • Equilateral Polygon: a polygon in which all of the sides are the same length

Types of Polygons continued • Regular Polygon: a polygon where all the angles are equal and all of the sides are the same length. They are both equilateral and equiangular

Examples of Regular Polygons

Names of Polygons • Triangle: a three sided polygon • Quadrilateral: a four sided polygon. A quadrilateral that is a regular polygon is called a square.