The diagram shows a circle with center a and radius r. diameters cad and bae are perpendicular to eachother. a larger circle has centre b and passes through c and d.
show that the area of the shaded region in terms of r.

How to use order of operation in 20 divide by 4 multiply 5 = 1

Raymond just got done jumping at super bounce trampoline center. the total cost of his session was $43.25 . he had to pay a $7 entrance fee and $1.25 for every minute he was on the trampoline. write an equation to determine the number of minutes (t) that raymond was on the trampoline.

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.