Answer:
C; 13
Step-by-step explanation:
pythagorean theorem. 12^2+5^2=c^2
144+25 = c^2
169 = c^2
13 = c
[tex]13[/tex]
here we using Pythagoras theorem
[tex]AC {}^{2} = AB {}^{2} + BC {}^{2} \\ AB {}^{2} = AC {}^{2} - BC {}^{2} [/tex]
[tex]12 {}^{2} - 5 {}^{2} = 144 - 25 = 169 \\ \sqrt{169} = 13[/tex]
