Point P is a point on the ground 12.3 metres from the base of a building with height h metres. The angle of elevation from the ground to the top of the building from point P is 63º.
b. Calculate the height h of the building. Round your answer to 1 decimal place,

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.