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Polygons The word ‘polygon’ is a Greek word. Poly means many and gon means angles. Polygons • The word polygon means “many angles” • A two dimensional object • A closed figure Polygons 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 Polygons Examples of Polygons Polygons These are not Polygons Polygons Terminology Side: One of the line segments that make up a polygon. Vertex: Point where two sides meet. Polygons Vertex Side Polygons • Interior angle: An angle formed by two adjacent sides inside the polygon. • Exterior angle: An angle formed by two adjacent sides outside the polygon. Polygons Exterior angle Interior angle Polygons Let us review Exterior angle Vertex Side Interior angle Polygons 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 Polygons • 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 Polygons Examples of Regular Polygons Polygons