UPDATE 2014-01-15: The attached .zip file now contains a Mathcad Prime 3.0 worksheet (.mcdx) and—for those of you who are still using earlier verisions of Mathcad—an Adobe Acrobat printout (.pdf) of the worksheet so can see how it is put together.
This worksheet finds the area within a rectilinear boundary using the coordinates of the boundary's vertex points. This worksheet does not deal with the post-survey adjustment processes and thus assumes that the coordinates being used are the final coordinates. Although this solution can be easily accomplished graphically in Autocad (or similar), the purpose of this worksheet it to show the mathematical solution to this problem.
(reposted from the main section of this forum at the suggestion of arbiter 007)