For a right triangle, a² + b² = c².
Read this first — it covers the idea in plain language with a worked example.
For any right triangle with legs a and b and hypotenuse c (the side opposite the right angle): a² + b² = c².
A right triangle has legs 3 and 4. Find the hypotenuse.
Watch out
The hypotenuse (c) is always the longest side and is opposite the right angle. Don't put a leg in the c spot.
Watch the main video, then check the second take if you want another explanation.
Another walk-through of the theorem with examples.
Watch on YouTubeTry a worksheet or work through some problems before the quiz.
A couple of questions to make sure this topic stuck. Retake as many times as you want.
The Pythagorean Theorem
A right triangle has legs 6 and 8. What is the hypotenuse?
