New Post: Working with coordinates and positions

I've figured out how to do geodetic calculations between Positions (lat/lon pairs). I've also figured out (with help from mogikanin) how to do calculations between Coordinates and Polygons which I think use X/Y pairs (Cartesian coordinates?). All my data starts off as lat/lon and I'm struggling to figure out how to do calculations (like distance and azimuth) between Coordinates and Polygons both of which are defined by lat/lon pairs. Can someone point me at an example or suggest an approach?

Thanks