MCV4U Unit 7 Activity 5 The Cross Product for Cartesian Vectors _. For a = [a' 6a3 6a4] and h= [b 6b3 6b4] then Trick: Write the components of the vectors in 2 rows starting with the 2"Cl component and repeating it at the end. Take the downward product minus the upward product. l > axb Eg.2: Find given 21= [36- . 631 and in = [46 6- .i If u 6 and w are coplanar, then x w is perpendicular to both and w and since u 6 and w are in the same plane, Eg.3: Determine if the following vectors are coplanar. u = 2696- 4 6 = 36- 46] and w= [, 62 6- 4]