a square
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a rectangle
parralelogram
A triangle can't be a quadrilateral because quadrilateral means it has to have 4 sides and they have to be equal and a triangle can only have 3 sides and doesn't have to be all equal sides. * * * * * Mainly correct, but the sides of a quadrilateral do not have to be equal.
All trapezoids must be quadrilateral. And, as the name suggests a quadrilateral has four sides.
rhombus. The rhombus is a quadrilateral with all sides equal in length. It is also a parallelogram, so opposite sides are parallel and equal in length, and opposite angles are equal.