Polygons are shapes that have three or more sides
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There is more to a polygon. It is a closed, plane (flat) shape. The three or more sides must be straight lines.
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it means that the polygons are similar not exact
If you mean a 4-sided polygon, then that is a quadrilateral. See related link for more information on polygons.
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 sides with the same marks are equal.
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.