Normally, none.
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Trapazoid
A trapezoid has exactly one pair of opposite parallel sides of different lengths
square
four... because quad means four :)
Yes. It is all of them: A Quadrilateral has 4 sides; a square has four sides, therefore it is a quadrilateral. A Parallelogram has two pairs of opposite sides parallel; the opposite sides of a square are parallel, therefore it is a parallelogram. A Rhombus has two pairs of opposite sides parallel AND all sides of equal length; the opposites sides of a square are parallel AND all sides are the same length, therefore it is a rhombus. A rectangle has four sides AND all angles 90o; a square has four sides AND all angles are 90o, therefore a square is a rectangle.