the area between 2 vectors is | a x b |.we could square the area on the following fomura. ( a dot b ) = | a | | b | cos( theta ) ( 1, 0, 0 ) x ( 0, 0, 1 ) = ( 0, 1, 0 ) means at least ( ?, x1*z2, ? ).( 0, 0, 1 ) x ( 1, 0, 0 ) = ( 0, -1, 0 …