What is the length of the hypotenuse of a 45-45-90 triangle with legs of length 5? A 10 B 5√3 C 5√2 D 25 ✓ Correct Answer: Option C In a 45-45-90 triangle, hypotenuse = leg × √2 = 5√2. Practice ACT Exam Prep Quizzes → Browse All Questions Study Flashcards