Polygons are plane (2 dimensional, or flat) figures that are bounded by three or more straight lines. The lines may or may not be of equal length, and the angles that each adjacent pair forms may be acute, right, obtuse or reflex.
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Like magnets.
There are a number of polygons that are similar to it but if you mean things that look like decagons than nonagon, undecagon, dodecagon, and octagon.
They are named for the number of sides and angles their shape posses. For example, an octagon has both eight sides and angles.
There are lots of different types of polygons Polygons are classified into various types based on the number of sides and measures of the angles.: Regular Polygons Irregular Polygons Concave Polygons Convex Polygons Trigons Quadrilateral Polygons Pentagon Polygons Hexagon Polygons Equilateral Polygons Equiangular Polygons
the two polygons are congruent if they are the same shape with the same measurements. If they can be flipped, rotated, and/or slid to look identical then they're congruent.