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Shoelace

Let $(x_1, y_1)$, $(x_2, y_2)$, $(x_3, y_3)$,..., $(x_n, y_n)$ be the coordinates of the vertices, arranged counterclockwise, of an n-sided convex polygon. Then the area of the polygon is given by the formula

$(x_1y_2 + x_2y_3 + x_3y_4 + ... + x_{n-1}y_n+ x_ny_1 - x_2y_1 - x_3y_2 - x_4y_3 - ... - x_ny_{n-1}- x_1y_n)/2$

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