There are a great number of different proofs of the Pythagorean Theorem. Unfortunately, many of them require diagrams which are hard to reproduce here. Check out the link to Wikipedia's page on the theorem for several different proofs.
No, it does not have a nickname.
Lena is a nickname for Alena. Len is also a nickname
his nickname is K2
how do spider monkeys get the nickname spider. where does that nickname come from.and how long have they has this nickname.
His nickname is 'Danger'. I don't know why this is his nickname but it just is!
His daughter Reginae has a nickname. Her nickname is "Nae Nae."
the nickname for oxford is Kent
Bobbi is a nickname for Roberta. Barbi is a nickname for Barbara.
love is the nickname