AFAIK they're all the same length. Not sure about angling but from my post here
https://www.flyertalk.com/forum/32920473-post4260.html the majority look like they've either got straight walls or walls angled slightly inwards with possible exceptions being 315 and 319 which look to have the last section of the wall on the side where there is no adjacent villa being a little set out from the next section (as you go inward from the sea towards the villa). You could try some of the maps in the wiki (there are a couple links there) and try from an overhead view with max zoom to about 20m. That might get you a clearer picture.