Find the length of the missing side of he triangle. Simplify the radical if necessary

Answer:
13
Step-by-step explanation:
Use Pythagora's theorem, a theorem stating that the two shorter legs squared will sum up to the third leg squared.
[tex]a^2+b^2=c^2\\5^2+12^2=c^2\\25+144=c^2\\169=c^2\\13=c[/tex]