Please help me out................

Answer: 90 Degrees
Step-by-step explanation:
I believe the answer is 90° because the diagonals of a rhombus, just like a square form right triangles. in reality, a rhombus is just a square that was pulled to the side a bit.
A good source to play with rhombuses is on mathisfun. It can help you build a study guide and further your understanding of the subject.