No, a trapezium is not a rhombus.
A trapezium, also known as a trapezoid in some regions, is defined as a four-sided figure (quadrilateral) that has at least one pair of parallel sides. The most common types of trapeziums are the isosceles trapezium, where the non-parallel sides are equal in length, and the right trapezium, which has a right angle.
On the other hand, a rhombus is a special type of quadrilateral where all four sides are of equal length. While a rhombus does have pairs of parallel sides, it also has other specific properties that differentiate it from a trapezium, such as the fact that its diagonals bisect each other at right angles and are not necessarily parallel.
In summary, while both shapes fall under the broader category of quadrilaterals, the defining characteristics of a trapezium and a rhombus are distinctly different, making them unique shapes.