Area of a Convex Polygon
The
coordinates (x_{1}, y_{1}), (x_{2},
y_{2}), (x_{3}, y_{3}), . . . , (x_{n},
y_{n}) 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.

Example: 
Find the area of this polygon:

See
also
Area
of a regular polygon, analytic
geometry
