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A parallelogram is a quadrilateral (polygon with four straight
sides) with the opposite sides parallel. The typical parallelogram
is shown in the Figure to the left along with other types of
quadrilaterals.
A rectangle, a rhombus, a square are all parallelograms, too.
They are special kinds of parallelograms. The bottom figures
show a trapezoid, a kite, and a general quadrilateral that
are NOT parallelograms, just for example.
Lessons under this topic consider different properties of
parallelograms.
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