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 \(360^\circ\).

All its angles add up to 360 degrees, just the same as any four sided shape. But a rhombus has matching pairs of opposite angles. Two are acute angles, smaller than 90 degrees. And two are obtuse ...