Actually, I already have the value I need converted.
This is not going to be drawn on the screen.
Basically, I have two values:
float length, width;
Both of these values are in degrees at longitude X and a latitude Y.
What I need is a function that given the longitude and latitude convert to kilometers:
ConvertDegreesToKM(length, X, Y);
ConvertDegreesToKM(width, X, Y);
There's got to be some method to do this buried in ArcGIS because it automatically displays a kilometer scale in the corner of the map.