A parallelogram can be thought of as a special trapezium. give reason

A trapezium is a quadrilateral  with only one pair of parallel lines but a parallelogram has two pairs of parallel lines. So, parallelogram is a special type  of a a trapezium. 
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a parallelogram is afour sided plane rectilinear figure with opposite sides parallel whereas a trapezium is a quadrelateral with one pair of sides parallel. That is why a parallelogeam can be thought of as a special trapezium.
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