By Zencalcy Editorial TeamLast reviewed About us
The classic a² + b² = c² in both directions: find the hypotenuse from the two legs, or recover a missing leg from the hypotenuse and the other leg. Every result shows the substitution step.
Hypotenuse from two legs, or a missing leg from hypotenuse + leg.
a² + b² = c²
| Symbol | Meaning |
|---|---|
| a, b | Legs of the right triangle |
| c | Hypotenuse (longest side) |
Legs 3 and 4 → c = √(9+16) = 5. Hypotenuse 13 with leg 5 → other leg = √(169−25) = 12.
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No — a² + b² = c² holds only for right triangles. For general triangles use the sine/cosine rule tools.
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Content updated: September 2026