Code in MATLAB

The area of a triangle whose three vertices are points (Xi, y), (X2, Уг), and (x3, y3) (see Figure 6.6) can be found from the equation (6.12) where I I is the determinant operation. The area returned will be positive if the points are taken in counterclockwise order, and negative if the points are taken in clockwise order. This determinant can be evaluated by hand to produce the following equation
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