Answer:For a regular quadrilateral such as square, each interior angle will be equal to: 360/4 = 90 degrees.Step-by-step explanation:For example, if an interior angle of a quadrilateral is 60°, then its corresponding exterior angle will be, 180 - 60 = 120°. In case, if the quadrilateral is a square or a rectangle, then all its exterior angles will be 90° each.