The radius of a circle is 6. using π, which equation expresses the ratio of the circumference of the circle to the circle's diameter?

Use the function f(x) is graphed below. the graph of the function to find, f(6). -2 -1 1 2

The larger of two number is 4 less than twice the smaller number. the sum is 41. find the numbers

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.