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A polygon is a closed, two dimensional figure composed of line segments. Squares, hexagons, rectangles and concave octagons are all polygons.

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en.wikipedia.org/wiki/Polygon

In elementary geometry, a

www.mathsisfun.com/geometry/polygons.html

A

study.com/academy/lesson/what-is-a-polygon-definition-shapes-angles.html

May 16, 2015

www.khanacademy.org/math/basic-geo/basic-geometry-shapes/basic-geo-properties-shapes/a/polygons-review

Review the term

www.sheppardsoftware.com/mathgames/geometry/shapeshoot/PolygonShapesShoot.htm

Learn about open and closed shapes the fun way in this

www.ask.com/youtube?q=Polygon Shapes&v=69lfTURDles

Jul 10, 2012 ... Download the Shape Videos: http://havefunteaching.com/videos/shape -videos/
Download the Shape Songs: ...

www.kidsmathgamesonline.com/facts/geometry/2dpolygonshapes.html

Enjoy learning about 2D

www.mathplayground.com/matching_shapes.html

Play Matching

www.mathopenref.com/polygon.html