Squares and rectangles must all have exactly four right angles.
However, quadrilateral that don't have to have four right angles are trapezoids, parallelograms and rhombi.
trapezoids - different angles
parallelograms - 2 acute, 2 obtuse angles
rhombi - 2 acute, 2 obtuse angles
Note that a rhombus is a type of parallelogram.
Hope this helps! :)
