Generalisation of Pythagoras theorem

[mertcan]

hi everyone, I would like say that there are lots of proofs related to pythagoras theorem in a flat space, but When I searched it's general form I have not found something worthwhile. Besides, I also involved myself to have a nice proof of it, as a result I have not any valuable or very close equation, so Could you help me obtain it's proof, share some pdf files, links related to derivation?

Very thanks in advance...

 

[fresh_42]

Did you mean this?
https://en.wikipedia.org/wiki/Law_of_cosines#Proofs
Or what is its generalized form?

 

[mertcan]

Did you mean this?
https://en.wikipedia.org/wiki/Law_of_cosines#Proofs
Or what is its generalized form?

ok ok, I found my answer on my own thanks again for your attention...