#color(indigo)(Properties of trapezoid"#
#"1. The sum of the two adjacent angles of a trapezium is 180 degrees or the adjacent angles are supplementary."#
#"2. A pair of opposite sides of a trapezium are parallel.
Hence, the angle between a side and diagonal is equal to the angle between the opposite parallel side and the diagonal."#
#"3.The cosines(cos) of two adjacent angles sum to 0. As adjacent angles are supplementary."#