How can i solve this problem ?
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The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

What is the equation of a line passing through (-6,5) and having a slope of 1/3

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.