Find the angles of the rhombus if the ratio of the angles formed by the diagonals and the sides is 4:5.

The angles created by the diagonals of a rhombus are complementary, meaning their sum is 90. if the ratio is 4:5, then the angle must be 40 degrees and 50 degrees. and since the diagonals of the rhombus bisects the interior angles of it. then the angles must be twice of 40 degrees and 50 degrees. so the angle are 80 and 100