Posted by Nick on Monday, May 2, 2011 at 9:10pm.
This is a job for Pythagoras.
a^2 + b^2 = c^2
5^2 + b^2 = 13^2
25 + b^2 = 169
b^2 = 169 - 25
b^2 = 144
b = 12
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