A quadrilateral is a four-sided shape. It could be a square, rectangle, kite, rhombus, parallelogram or trapezium. For any quadrilateral, the angles of the four corners add up to \(360^\circ\).

In other words, the sum of 𝑎 + 𝑏 × 𝘩, all divided by two. When the trapezium has two right angles, the two congruent trapeziums make a rectangle. The parallel sides are always on ...