Answer:
C
Step-by-step explanation:
AB is the hypotenuse of a right triangle.
Using Pythagoras' identity
The square on the hypotenuse is equal to the sum of the squares on the other 2 sides, that is
AB² = 12² + 5² = 144 + 25 = 169 ( take the square root of both sides )
AB = [tex]\sqrt{169}[/tex] = 13 → C
