Find all numbers whose absolute value is -8

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

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.

Which rule describes the composition of transformations that maps △abc to △a”b”c