The 360 degree thing isn't related to the metric system at all. It goes way back to ancient Greek mathematicians. At the time it was thought that there were 360 days in a year, so they divided the circle into 360 segments. Just be glad they didn't have the calendar pegged or we would have 365.2425 degrees in a circle.
Switching to a different system of weights and measures is hard and nobody wants to do it, so we just keep passing it on to the next generation. If I had my way we would just bite the bullet and change it, but instead we just keep trucking along while billions of dollars are lost in engineering mistakes due to conversion errors.
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