How Do X1 and X2 Determine Delta R in Advanced Mechanics?

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http://img136.imageshack.us/img136/6353/mechanicsau9.jpg

I have this question for my WebAssign and I am not sure what to do with it. I thoght about how to use the X1 and X2 to get delta r but I really have no idea where to start. Please help! Much appreciated
 
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I used it and got 11,624.97312. I entered 11,624.97 into Webassign and it came out a wrong answer. Could someone tell me if this is the right answer and I am entering it wrong or if I completely did this wrong?

I found one leg of the small triangle at the top of the diagram by subtracting 4900-3200, and used X1 as the other leg..then uesd the pythagorean theorem.
 
nevermind, got the answer, thanks a lot. I've got another mechanics question if anyone's around.