Use the diagram to find the angle measures that satisfy each case. Find each case. The measure of the first angle is 30 degrees greater then the measure of the second angle. HELP PLS

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.