How many sides does a trapezium have?

The story behind the answer

4 is correct: a trapezium is a quadrilateral—a polygon with four sides—characterized by at least one pair of parallel sides (the bases) and two non-parallel sides (the legs). Count them: two bases + two legs = four.

Note: in US English, this shape is usually called a trapezoid; “trapezium” there can mean a four-sider with no parallel sides. Either way, they’re quadrilaterals, so they have four sides. Memory trick: think “quad” = four, and picture a trapezium as a roof with two parallel edges and two slanted rafters—two bases, two legs, four sides. Its area uses the two bases: A = (a + b)/2 × h.