It's simple geometry... From 1. to 0. of turnout for radius 232.32 I have 13.6187m. 2*13.6187+6*8.5=78.2374 in your picture is 78.237. In my case the distance from 1. to 0. for radius 205.13 is 12.025, therefor 2*12.025+6*8.5=75.05m. --- Check your source ;)
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