What is the correct definition of trapezium?

In geometry we define a figure either with the help of sides or angles or both. Side definition- Trapezium is a quadrilateral which has ONLY one set of parallel lines. So a parallelogram is not a Trapezium. Angle definition : If A:B:C:D are angle ratio of a quadrilateral then it is said to be a Trapezium if and only if. read more

Trapezium is a quadrilateral with a pair of parallel sides and a pair of non- parallel sides. By this definition we can say that parallelogram is not a trapezium and vice versa. There are 2 types of trapezium uniform and non-uniform trapezium. read more

Others define a trapezoid as a quadrilateral with at least one pair of parallel sides (the inclusive definition), making the parallelogram a special type of trapezoid. The latter definition is consistent with its uses in higher mathematics such as calculus. read more