State if the two triangles are congruent. If they are, state how you know. See picture for full problem. Please and thank you!

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.

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.