Expression 8: "D" equals "x" Subscript, 1 , Baseline "y" Subscript, 2 , Baseline minus "x" Subscript, 2 , Baseline "y" Subscript, 1 , Baseline plus "x" Subscript, 2 , Baseline "y" Subscript, 3 , Baseline minus "x" Subscript, 3 , Baseline "y" Subscript, 2 , Baseline plus "x" Subscript, 3 , Baseline "y" Subscript, 1 , Baseline minus "x" Subscript, 1 , Baseline "y" Subscript, 3 , BaselineD=x1y2−x2y1+x2y3−x3y2+x3y1−x1y3