So this morning's prompt is 'side-car bicycle' and I think it works pretty good, maybe with a little vertical stretch. I'll post it later...

Back to the code. Obviously, this many years on, I need to actually accomplish something, I'm 54 tomorrow! So just get the initial trial done tonight, with an area from the cross product, dongma? We need to revise the point to handle seven coordinates, lat/lon, XYZ and the horizontal and vertical position inside my map div. Splat out an initial point and make two more, make that triangle, find the area and print it to the page.