Question 1

What if my triangle is not right-angled?

Accepted Answer

Then the Pythagorean theorem does not apply directly. Use a different approach such as the Law of Cosines for general triangles.

Question 2

Can the square root expression become negative?

Accepted Answer

If you enter inconsistent side lengths (for example, a leg longer than the hypotenuse), the inside of the square root may become negative. Check your inputs.

Question 3

Are units required?

Accepted Answer

Yes, but only consistency matters. If legs are in centimeters, the result will be in centimeters too.

Pythagorean Theorem Calculator

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