In triangle ABC, angle B is 90 degrees. If the length of hypotenuse AC is 13 and the length of side BC is 5, what is the area of triangle ABC?

✓ Correct Answer: Option B

Using Pythagorean theorem: AB^2 + 5^2 = 13^2 => AB^2 = 169 - 25 = 144 => AB = 12. Area = (1/2) * base * height = (1/2) * 5 * 12 = 30.