There are several ways.They can be classified as convex or concave.
They can be classified by the number of sides of equal length(s).
They can be classified by the number of sides of equal angles.
They can be classified by the number of parallel sides.
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a quadrilateral has 4 sides.
The quadrilateral is a 4-sided polygon, quadrilaterals consist of kites, trapezoids, squares, rectangles, rhombuses, and parallelograms. The regular quadrilateral polygon is the square.
Any polygon that has 4 sides is a quadrilateral
a quadrilateral or a parallelogram.
A quadrilateral