Answer:
option B. 
Step-by-step explanation:
we know that
1) The two diagonals of a rhombus are perpendicular
2) The sum of the interior angles in any triangle must be equal to 180 degrees
Let
O ----> the intersection point of the diagonals of the rhombus
In the right triangle OAD

solve for x




Is there like a picture or something?
Answer:

Step-by-step explanation:

<h3>Hope it is helpful....</h3>
An=an-1-3
I hope this helps.