There is only one regular quadrilateral, the square. A regular polygon must have equal sides and equal angles, and in the case of quadrilaterals that is a square.
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Congruence is a relationship between two shapes. ANY one shape cannot be congruent.
A quadrilateral has four sides, and so four quadrilaterals will have a total of 16 sides counted separately.
35.
Its basically a hierarchy just for quadrilaterals.
Not all quadrilaterals are rectangles. Some quadrilaterals are rectangles, and the rest are not. However, all rectangles are quadrilaterals.