Trapezium (noun)

1. In geometry, a trapezium is a quadrilateral with one pair of parallel sides.
2. A four-sided shape with one pair of parallel sides and two non-parallel sides.

Origin:

From the greek word "trapezion" meaning small table.

Examples:

1. A trapezium can be divided into a rectangle and two right-angled triangles.
2. The area of a trapezium can be calculated using the formula: (a+b)/2 * h where a and b are the parallel sides and h is the height.
3. The trapezium is a common shape in construction and engineering, often used in beams and trusses.
4. The trapezium is a type of polygon with 4 sides.
5. The trapezium was used as a unit of measurement in ancient Greece to measure the length of the human foot.