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Polygons can be regular or irregular?
Yes, a regular polygon has all sides of equal length. An irregular polygon is any polygon that is not regular.
Which polygon does not tessellate and why?
Most regular polygons will not - by themselves. In fact, of the regular polygons, only a triangle, square and hexagon will. No other regular polygon will create a regular tessellation. However, for polygons with any number of sides, there are irregular versions that can tessellate.
What is the difference between a concave polygon and a convex polygon?
Any polygon that has an angle that is > 180º is a concave polygon. A convex polygon does not. e.g. All regular polygons are convex.
What regular polygons have parallel sides?
Any regular polygon with an even number of sides must have parallel sides.
Do regular polygons tessellate?
Any polygon with external angles which are equal to a factor of 360 will tessellate. The only regular polygons which will tessellate are equilateral triangles, squares, and hexagons.
