If abcd is a parallelogram, what can we say about the diagonals bd and ac?

How to simply and write the answer n a whole number

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.

What is the point slope form of a line with slope -5 that contains point (2,-1)