SAT Lines, angles, and triangles Question

In triangle XYZ, angle Y is a right angle, the measure of angle Z is $39^{\circ }$ , and the length of $\overline{YZ}$ is 22 units. If the area, in square units, of triangle XYZ can be represented by the expression k tan $39^{\circ }$ , where k is a constant, what is the value of k?