Polygons Polygons
Polygon Any shape where every segment intersects exactly two others at its endpoints.
Naming a polygon By its vertices in consecutive order AB CD
Parts of polygons: SideVertexDiagonalPolygon Polygonal region Interior/ Exterior
Classifying by sides: 3-Triangle4-Quadrilateral5-Pentagon6-Hexagon7-Heptagon8-Octagon9-Nonagon10-Decagon n- gon
Regular Polygon Any polygon where all sides and angles are congruent
Concave or Convex : A polygon can be either concave or convex. If you can draw a lines extending all sides and not touch then it is convex.
Perimeter The sum of the lengths of its sides P = add the length of all sides