the pythagorean theorem is a^2+b^2=c^2
You have a and c already, so its 5^2+b^2=13^2
13^2 equals 169. 5^2 equals 25.
You now have 25+b^2=169
169-25=144
The square root of 144 is 12.
The other leg is 12 units
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