Exactly right... Let's simplify Arthur P's thread and break out a calculator for a second:

Deer = 25 yards away.
You = 22' up in a tree stand (7.33333 yards to be exact).

25 yards squared is 625 (a^2)
7.33 yards squared is 53.77 (b^2)
-------------------------
-------Total:-----> 678.77 (c^2)

Now do a simple square root of 678.77 -----> 26.05 total yards