2 1. A plane figure formed by three or more segments called sides. Polygon1. A plane figure formed by three or more segmentscalled sides.2. Each side intersects exactly two other sides,one at each endpointSides:the segments that form the polygon.Vertex:an endpoint of a side of the polygonNo Curves!A closed figure.
3 Identifying Polygons C D A B E one of its sides intersects more than two other sidesBsome of its sides are notsegments(No curves allowed!)Etwo of the sides intersectonly one other side(Must be a closed figure)
4 Names 3 Triangle 4 5 Quadrilateral 6 7 Pentagon 8 9 Hexagon 10 12 Polygons are named by the # of sides they have34567891012nTriangleQuadrilateralPentagonHexagonHeptagonOctagonNonagonDecagonDodecagonn-gon
5 all interior angles are Convex polygon:If you extend any of the sides, the side will not cut through the polygon.Equilateral polygon:All sides areEquiangular polygon:all interior angles areConcave polygon:If you extend a side, the side may cut through the polygon.
6 Identifying Convex and Concave Polygons Identify the polygon and state whether it is convex or concave6hexagonconvex7heptagonconcave
7 Regular polygons A polygon is regular if it is both __________and ___________Diagonal: ____________________ ____________________.equilateralequiangular.A segment that joins two nonconsecutive vertices.