How to decipher the curve measurements in a track chart?

Blutorse4792

Now T:ANE I can get into
Below are two snippets from an old track chart, specifying the width and alignment (or rather, the "alinement") of the right-of-way:

alinement2.jpg

alinement1.jpg


The listed widths are fairly self-explanatory, but I'm at a bit of a loss as to how to interpret those curvature/radii measurements... Mathematics were never my favorite subject in school, you see 🫠

Are there any resident geometry buffs who might be so kind as to help me make some sense of this?

Thank you!
 
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