The examples in the graphs are for a turn that ends up at 180 degrees. For those who who want a formula to calculate the sizes for any angle of turn.

R = the  radius of the  turn when it is flat
r  = the  radius of the  turn after being bent into a banked turn

A = the angle of the  turn when it is flat
a = the angle of the  turn after being bent into a banked turn

R/r = a/A

The cosine of the banking angle = A/a

- or if you prefer a diagram