In a right triangle with legs 3 and 4, what is the hypotenuse? A 7 B 12 C 5 D 25 ✓ Correct Answer: Option C Pythagorean theorem: c² = 3² + 4² = 9 + 16 = 25; c = 5. Practice ACT Exam Prep Quizzes → Browse All Questions Study Flashcards