Because they all have 4 sides.
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'A square is a type of rectangle, a rectangle is a type of paralellogram, a paralellogram is a type of trapezoid, a trapezoid is a type of quadrilateral.
Every rectangle has. That includes every square.
Sure, a square is a rectangle and the diagonals of a square are perpendicular.
quadrilateral
There is none. A quadrilateral is any polygon that has four sides and four corners, and all angles are 90 degrees. A rectangle is a type of quadrilateral.