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Geometry

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Is it a Polygon?

Polygons are 2-dimensional shapes. They are made of straight lines, and the shape is "closed" (all the lines connect up).

Polygon
(straight sides)
Not a Polygon
(has a curve)
Not a Polygon
(open, not closed)

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Simple or Complex

A simple polygon has only one boundary, and it doesn't cross over itself. A complex polygon intersects itself!

Simple Polygon
(this one's a Pentagon)
Complex Polygon
(also a Pentagon)

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