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Trapezoid (USA) - Trapezium (UK)

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A quadrilateral which has at least one pair of parallel sides is called a trapezoid. [AB]//[CD]. Each of the parallel sides is called a base of the trapezoid. The non-parallel sides are the legs.

MEDIAN

The median of a trapezoid is a line joining the midpoints of the two legs. Median line is always parallel to the bases. [AB]//[EF]//[DC]
The length of the median is the average length of the bases.

PROOF

ANGLES OF A TRAPEZOID

PROOF

ALTITUDE

The distance between the parallel sides (bases) is equal to the altitude of the trapezoid.

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