A quadrilateral is a generic term used to describe a four sided polygon. In other words, it is a shape that has four sides.
A rectangle, rhombus, parallelogram and trapezium (trapezoid) has four sides. In light of this, it can be classified as a quadrilateral but, if the quadrilateral has no sides and angles equal, it could not be classified as any of the foregoing.
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A square and a trapezoid
Parallelogram, Rectangle, Rhombus, Square, Kite, Trapezoid.
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a square , a rectangle, a trapezoid, a parallelogram, a rhombus
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