Hello

I have a rather simple mathematic problem to solve. However I am not that mathematically inclined so I'd appreciate if someone could provide advice on how I solve this mathematic problem:

For the following triangle I wish to find the location (X,Y & Z) of the point/vector C. How can I find this position?

Using simple Pythagoras I can find the length of side Z. But how can I find the position of C? I am attempting to offset/parallel a straight line segment (side X) so I need to calculate the position of C.