Question 83633
With trigonometry and geometry, it is wise to draw a diagram so you can better understand the problem.

I'll let you draw the diagram.

Since we have the angle and we are trying to find the adjacent side with respect to the angle, we will be using the tan ratio.

Tan = opp/adj

Tan12 = 45/Distance

Tan12(Distance) = 45

Distance = 45/Tan12

Take it from here. Please reply if you need more help!