New Post: Polygon.Area - what are the units?

I'm not sure if this is the most "correct" way of doing it, but I calculated the area of a shape in Lat/Long using the code below. First I may an array of X/Y coordinates in the shape, then multiplied each one by .017453293 (0.017453293 converts degrees to radians: 2pi/360). Then I looped through each of the point to find the area

'm-2 because the starting point must be the same as the ending point
For j = 0 To numpoints - 2

 Area = Area + ((X(j + 1)) - (X(j))) * ((Math.Sin(Y(j))) + (Math.Sin(Y(j + 1))))

Next

Then to chose which unit I wanted to display the area

'Example for Feet
AreaFt = Math.Abs(Area * 6378137 * 6378137 / 2) * 10.76391041671

This got me pretty close to the correct area, even though it is not absolutely exact.