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A trapezium is a quadrilateral whose two opposite sides are parallel, but the other two are not parallel.

\(AD\) and \(BC\) are two parallel edges are termed as bases.

\(AB\) and \(CD\) are two non parallel edges are termed as lateral sides.

In trapezium, whose lateral sides (\(AB\)) \(=\) (\(CD\)) are equal, then the trapezium is known as isosceles trapezium.

**Properties:**

- The bases of the trapezium are parallel to each other (\(AD || BC\)).

- The sum of its angles is \(360°\).

- The diagonals of a regular(all sides and angles are equal) trapezium bisect each other. In regular trapezium (\(AB = BC = CD = DA\)) and (\(∠A = ∠B = ∠C = ∠D\)).