Plz I need all the three of the question 12 graphs answered.

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.

Which graph has figures that can undergo a similarity transformation to justify that they are similar? (obviously not the third one)

Find the measure of angle a in the following triangle