Emmanuel added 8 links per minute to his chain mail. alesia started 20 minutes after emmanuel and added 13 links per minutes to get chain mail. how long had emmanuel worked with alesia caught up to him, and how many links had to be added?

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

Consider the triangle. which shows the order of the angles from smallest to largest? angle a, angle b, angle c angle b, angle a, angle c angle b, angle c, angle a angle c, angle a, angle b

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.