Karen bought a new photo album with 40 pages. If each photo takes up 1/6 page, how many photos can she put in her new album?

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Two triangles can be formed with the given information. use the law of sines to solve the triangles. b = 49°, a = 16, b = 14

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.