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Pythagorean theorem worksheet

Find the missing side of a right triangle. Every answer is a whole number. Harder sets ask for a leg too. Free, printable, and the answer key prints on its own page, so the work comes first.

How to solve them

1. a² + b² = c², where c is the hypotenuse: the longest side, opposite the right angle.
2. Finding the hypotenuse: square both legs, add, then take the square root.
3. Finding a leg: square the hypotenuse, subtract the other leg squared, then take the square root.

New to this? The short lesson on it has the rules in one place.

Check the key only once you've finished. A wrong answer is useful: find the first line where your working went wrong, fix that, and redo the problem.