Area of a Convex Polygon
coordinates (x1, y1), (x2,
y2), (x3, y3), . . . , (xn,
yn) of a convex polygon are arranged in the "determinant" below.
The coordinates must be taken in counterclockwise order around
the polygon, beginning and ending at the same point.
Find the area of this polygon:
of a regular polygon, analytic