234

( b 2 + c 2 ) = ( b 2 ) + ( c 2 )

345

( c 2 + d 2 ) = ( c 2 ) + ( d 2 )

452

( b 2 + c 2 + d 2 ) = ( b 2 + c 2 ) + ( d 2 )

523

( b 2 + c 2 + d 2 ) = ( b 2 ) + ( c 2 + d 2 )