Geometry: Parallelograms

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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