Polygons

What makes a polygon? 

Have you read this book?  It's a terrific story about a triangle who changes into other polygons.

Here's a right triangle

Quadrangle (specifically a trapezoid)

Regular Hexagon

another hexagon (six-sided figure)

one more hexagon

a CONVEX polygon

a CONCAVE polygon



If the sides are CURVED it CANNOT be a polygon:

If the sides INTERSECT it CANNOT be a polygon:

(In addition, if the sides are OPEN it cannot be a polygon)

Be sure to check out some of our favorite polygon links...
http://www.brainpop.com/math/geometryandmeasurement/polygons/preview.weml
(BrainPOP video)

http://www.youtube.com/watch?v=Rpkjb4Tx844&feature=related
("I am a Parallelogram" Song)

http://www.youtube.com/watch?v=TbR_rakilds&feature=related
(The Polygon Song)