Pythagorean Theorem
Calculate the missing side of a right triangle using the Pythagorean theorem (a² + b² = c²).
How to Use the Pythagorean Theorem
- 1
Enter known sides
Input the lengths of two sides of the right triangle.
- 2
Select which side to find
Indicate whether the unknown side is a leg or the hypotenuse.
- 3
View the result
See the missing side length and area of the triangle.
💡 Tips & Tricks
- •The hypotenuse is always the longest side and is opposite the right angle.
- •Use this for distance calculations — the distance formula is derived from the Pythagorean theorem.
- •Remember common triples (3-4-5, 5-12-13) for quick mental math.
Frequently Asked Questions
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