What is the measure of angle x for this ramp?

1) Let's find out the angle x, using trigonometric ratios. So since we have the opposite leg to angle x and the adjacent leg to angle x we can write out that:
[tex]\sin (X)=\frac{1}{12}[/tex]2) But since we want to know the angle, so we need to calculate the arcsine of (x):
[tex]undefined[/tex]