A rhombus is a type of parallelogram, and what distinguishes its shape is that all four of its sides are congruent.
One of the properties of a rhombus is the fact that diagonals are perpendicular. In another words, the given three measures all measure 90º.
Using this information for m∠1, we can determinate the value of x.
Now that we have the value for x and the measure of ∠2 we can determinate y.
We have the measure of ∠3, therefore, we can determinate z.
The values of each variable are