Online Pythagorean theorem calculator. Enter any two sides of a right triangle (leave the unknown blank) to find the third via a²+b²=c²—ideal for right triangles.
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a² + b² = c²
One leg
The other leg
Hypotenuse, blank if unknown
📖 Tutorial | Pythagorean Theorem
1. Definition
The legs’ squares sum to the hypotenuse square: a²+b²=c².
2. Formula & Notation
a, b
Legs
c
Hypotenuse
Converse
a²+b²=c² ⇒ right triangle
3. Properties & Laws
Right triangles only;
Hypotenuse is longest;
Converse tests for right;
Triple (3,4,5).
4. Steps
Fill two sides, leave unknown blank;
Click "Find Side";
Or click "Load Example".
5. Worked Examples
Example: legs 3 and 4. Solution: c = √(9+16) = 5.
6. Common Pitfalls
Leave the unknown blank; Hypotenuse exceeds legs; Not for non-right triangles.