Pythagorean Theorem Practice — Find the Missing Side (Free)
Practice the Pythagorean theorem with this free tool. Find the hypotenuse or a missing leg of a right triangle — the problems use whole-number answers, and each solution shows a² + b² = c² worked out.
How the practice works
- Pick a difficulty.
- Find the missing side and press Check.
- Read the feedback and step-by-step solution, then press Next.
The theorem
In a right triangle, a² + b² = c², where c is the hypotenuse. Rearrange to find a missing leg: b = √(c² − a²).
Original price was: $109.99.$54.99Current price is: $54.99.
Frequently asked questions
What is the Pythagorean theorem?
For a right triangle, a² + b² = c², where c is the hypotenuse (the side opposite the right angle).
Are the answers whole numbers?
Yes — the triangles use Pythagorean triples so the missing side is a whole number.
Original price was: $109.99.$54.99Current price is: $54.99.
Is it free?
Yes — unlimited problems, no sign-up, with progress saved in your browser.
Original price was: $109.99.$54.99Current price is: $54.99.
Read the full lesson: learn the method step by step.
Original price was: $27.99.$17.99Current price is: $17.99.
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