345

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

451

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

513

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

134

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