1.6 Classify 1.6 Classify PolygonsPolygons

Identifying PolygonsIdentifying Polygons• Formed by three or more line

segments called sides.• It is not open.• The sides do not cross.• No curves.

POLYGONS

NOT POLYGONS

TermsTerms• Convex: a polygon is convex if no line that

contains a side of the polygon contains a point in the interior of the polygon.

•Concave: a polygon that is nonconvex.

Classifying PolygonsClassifying PolygonsNumber of

SidesType of Polygon Number of

SideType of Polygon

3 Triangle 8 Octagon

4 Quadrilateral 9 Nonagon

5 Pentagon 10 Decagon

6 Hexagon 12 Dodecagon

7 Heptagon n n-gon

DefinitionsDefinitions• n-gon: a polygon with n number of

sides.• Equilateral: a polygon whose sides

are all congruent.• Equiangular: a polygon whose

angles are all congruent.• Regular: a polygon whose sides are

equilateral and whose angles are equiangular.