Help me with this math 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.

Aright cylinder has a diameter of 8 m and a height of 6m. what is the volume of the cylinder

30 points if you answer all 3 questions with work!