Math
Pythagorean Theorem
Enter two sides, get the third. Works for any side.
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Fill in two sides — leave the third empty.
a² + b² = c²
Result
Enter two sides to find the third
What does Pythagorean Theorem?
Calculate the missing side of a right triangle using the Pythagorean theorem.
How to use Pythagorean Theorem?
- Enter two of the three sides of the right triangle.
- Leave the unknown side blank.
- Click Calculate to find the missing value.
Key features
- Solves for any of the three sides (a, b, or c).
- Shows step-by-step calculation.
- Supports decimal values for high precision.
Frequently asked questions
What is the Pythagorean theorem?
It states that a² + b² = c², where c is the hypotenuse of a right triangle.
Can I use this for non-right triangles?
No, the theorem only applies to right triangles; use the law of cosines for other triangles.
Is this tool free?
Yes, this tool is completely free and requires no registration.
Is my data saved?
No. All calculations happen in your browser only — no data is sent to any server.