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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).
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| Polygon (straight sides) | Not a Polygon (has a curve) | Not a Polygon (open, not closed) |
Rich text note
Simple or Complex
A simple polygon has only one boundary, and it doesn't cross over itself. A complex polygon intersects itself!
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| Simple Polygon (this one's a Pentagon) | Complex Polygon (also a Pentagon) |