The angle that makes up this vertex of this quadrilateral is . So to summarise the properties of a trapezium: a) A quadrilateral with a pair of parallel sides. A trapezium is also called Trapezoid. Opposite sides of an isosceles trapezoid are the The diagonals of the rhombus bisect each other at 90 degrees. If one angle is right, then all angles are right. opposite sides are parallel. Some of the properties of a trapezium are listed below: The sum of the angles of a trapezium is 360º A trapezium is not a parallelogram (as only one pair of opposite sides is parallel in a trapezium and we require both pairs to be parallel in a parallelogram). In a scalene trapezium, if i can use that term, the 4 angles A, B, C and D, are unequal. Explore the angles in quadrilaterals worksheets featuring practice sets on identifying a quadrilateral based on its angles, finding the indicated angles, solving algebraic equations to determine the measure of the angles, finding the angles in special quadrilaterals using the vertex angle and diagonal properties … An isosceles trapezium has two pairs of equal angles (