I'd long believed that it was impossible to trisect an angle. Started googling it recently and found that thats not quite true. You can do it if you have marks on the straight edge, the original "rules of the game" were pencil paper compass and unmarked straight edge.
http://ift.tt/1IdZmaS see 1/2 way down the page or attached snippett below
Am curious - why did 360 degrees survive decimalisation ? I have seen web pages advocating a decimal degree system but it never caught on. ie 400 units defining a full circle each quadrant being 100 units and abolishing minutes and seconds just have decimal places.
I've read on the internet that old European theodolites can be marked up in 400 Gradians and that the French Military used Gradians
http://ift.tt/1Gx5iVT
Bill
http://ift.tt/1IdZmaS see 1/2 way down the page or attached snippett below
Am curious - why did 360 degrees survive decimalisation ? I have seen web pages advocating a decimal degree system but it never caught on. ie 400 units defining a full circle each quadrant being 100 units and abolishing minutes and seconds just have decimal places.
I've read on the internet that old European theodolites can be marked up in 400 Gradians and that the French Military used Gradians
http://ift.tt/1Gx5iVT
Bill
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