Yes, a square is indeed a trapezium. To understand why, we first need to clarify the definitions of these shapes. A trapezium, also known as a trapezoid in some regions, is defined as a quadrilateral that has at least one pair of parallel sides. In the case of a square, it has four equal sides and all angles are right angles (90 degrees). The opposite sides of the square are parallel, meeting the basic criterion for being a trapezium.
Furthermore, since a square is a specific type of rectangle (which is another type of trapezium), it falls under the broader category of trapeziums. In conclusion, while all squares are trapeziums, not all trapeziums are squares, as trapeziums can have sides and angles of different lengths and measures.