If a triangle has sides 5, 12, and 13, is it a right triangle?

A Yes

B No

C Not enough information

D Only if it is isosceles

✓ Correct Answer: Option A

5² + 12² = 25 + 144 = 169 = 13². Since a² + b² = c², it is a right triangle.

💡 Why is A) the correct answer?

The correct answer to the question "If a triangle has sides 5, 12, and 13, is it a right triangle?" is Option A: Yes.

The other options — B) No, C) Not enough information, D) Only if it is isosceles — are incorrect for this ACT Exam Prep question. As explained above: 5² + 12² = 25 + 144 = 169 = 13². Since a² + b² = c², it is a right triangle.

📚 About This ACT Exam Prep Practice Question

This 2-level ACT Exam Prep question from the Mathematics topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free ACT Exam Prep practice test or use flashcards for spaced repetition review.

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If a triangle has sides 5, 12, and 13, is it a right triangle?

✓ Correct Answer: Option A

📚 About This ACT Exam Prep Practice Question

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