A quadrilateral with four right angles is called a rectangle.
A rectangle is a specific type of quadrilateral, which means it has four sides. The defining characteristic of a rectangle is that all four of its interior angles are right angles, measuring 90 degrees each. This property ensures that the opposite sides of a rectangle are not only equal in length but also parallel to each other.
Additionally, rectangles are a subset of parallelograms, which are quadrilaterals with opposite sides that are parallel. However, while all rectangles are parallelograms, not all parallelograms are rectangles. The unique trait of having all angles as right angles sets rectangles apart from other types of quadrilaterals like rhombuses or trapezoids, which do not necessarily have right angles.