A trapezium, or diamond shape. Imagine you have a rectangle, and you push the top left corner to the right a little.
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A square has 4 equal sides, 2 pairs of parallel sides and 4 right angles.
a tetrahedon
paralellogram
A TRAPEZIUM. Trapezia can be SYMMETRIC or ASSYMETRIC. That is Non-parallel sides can be of the same length or of different lengths/ intersext at different angles to the parallel lines.
A shape with parallel sides but no right angles is called a parallelogram