(*^

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                                    Area and Torque in Two Dimensions

The cell below defines a procedure  Wedge2  that computes the wedge product of two two-dimensional vectors and then illustrates how this procedure is used.  Evaluate the next cell now.
;[s]
6:0,1;69,0;107,1;113,0;228,2;254,0;256,-1;
3:3,13,9,Times,0,12,0,0,0;2,13,9,Times,1,12,0,0,0;1,13,9,Times,1,12,65535,0,0;
:[font = input; preserveAspect; ]
Wedge2[u_, v_] := u[[1]] v[[2]] - u[[2]] v[[1]]

a := {1, 2}
b := {3, 4}

Wedge2[a, b]
^*)