# Tag Info

### Which theorems have Pythagoras' Theorem as a special case?

The Law of cosines is the first that comes to my mind: $$c^{2}=a^{2}+b^{2}-2ab\cos \gamma$$ (source: Wikipedia) If $\gamma$ is a right angle, its cosine is 0 and all that remains is Pythagoras' ...

### Which theorems have Pythagoras' Theorem as a special case?

Parseval identities in the theory of Fourier series and integrals.

• 115k
Accepted

• 32.9k