CK12 - Geometry

Therefore,the polygonis concave.

C. One of the segmentsgoesthroughthe exterior.

Thus,the polygonis concave.

ClassifyingPolygons

The mostcommonway to classifya polygonis by the numberof sides.Regardlessof whetherthe polygon
is convexor concave,it can be namedby the numberof sides.The prefixin eachnamerevealsthe number
of sides.The chartbelowshowsnamesand samplesof polygons.

PolygonName Numberof Sides SampleDrawings

Triangle 3

Quadrilateral 4

Pentagon 5

Hexagon 6

Heptagon 7