A right triangle has the 3/4/5 rule, which is pythagorean theorum.
A^2 (A squared) + B^2 (B squared) = C^2 (C squared).
You can test this.
Let's try the first option, A.
3^2 (A) + 4^2 (B) = 5^2 (C).
3^2 = 9, B^2 = 16, C^2 = 25.
9 + 16 = 25.
A.) is the correct answer.
