A parallelogram. A rhombus, rectangle or square are special cases.
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Parallelogram, Rectangle, and Isosceles Trapezoid, opposite sides are congruent.
Slanted polygons, rectangles, squares, trapazoids, kites
quadrilaterals are consecutive and opposite angles always congruent?
Of the quadrilaterals: a square, a rectangle, a parallelogram and a rhombus
squares