The pillars of a temple are cylindrically shaped. of each pillar has a circular base of radius 280 cm and height of 10 m how much concrete mix will be used to build 14 such pillars

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.