Question

What’s the correct answer for this question?

Answer 1

C. 12.

Explanation:

Triangle ABC is right-angled so we can apply the Pythagoras Theorem here:

13^2 = 5^2 + AB^2

AB^2 = 13^2 - 5^2

AB^2 = 169 - 25 = 144

AB = 12.