What is the perimeter of this shape? 60mm
(15mm
40mm
30mm
OP = 200 mm
OP = 210 mm
O P = 150 mm
OP = 145 mm

Which letters from the table represent like terms? a and b b and c a and d b and d

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.

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