What’s the answer to this problem?

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi

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.