123
( a 2 + b 2 ) = ( a 2 ) + ( b 2 )
234
( b 2 + c 2 ) = ( b 2 ) + ( c 2 )
341
( a 2 + b 2 + c 2 ) = ( a 2 + b 2 ) + ( c 2 )
412
( a 2 + b 2 + c 2 ) = ( a 2 ) + ( b 2 + c 2 )