[jamesqf]

Originally Posted by P-hack

https://en.wikipedia.org/wiki/Gradian is the metric angle, i.e. centigrade, but the circle is divided by 400... I think I did one problem using gradians in my entire life.

Yeah, I still have an HP scientific calculator that will do angles in grads, though I can't remember ever having used the function.

The Wikipedia link mentions a couple of other metric system sillynesses that I hadn't thought of. First, they define the "gradian" as 1/100th of a quarter circle, thus making it inevitiable to use powers of 2 for half and full circles, while the very common 30 and 60 degree angles become infinitely-repeating decimals. And then they go and change the name of the centigrade temperature scale to avoid conflict with this system that almost nobody uses.