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A trapezium has only one pair of parallel sides
7 sides
2(Adjacent) * * * * * You cannot have a polygon with two sides! A trapezium has four sides - whether it is isosceles or not.
A trapezium has 1 pair of opposite parallel sides of different lengths. Note that sometimes a trapezium is called a trapezoid
It may have none. A trapezium (US) has no parallel sides. A trapezoid (US, known elsewhere as a trapezium) has one side of parallel sides.