1) Radius =
TAS ² / G x TAN Φ
2) LF = 1/COS Φ
Firstly, re-arrange to be the same as TAN Φ = TAS
² / G x Radius
Therefore TAN Φ = (200 x .514) / 10 x 2000
TAN Φ = 0.528
TAN - ¹ 0.528 = 27.83
Here you put it into the other equation…
LF = 1/COS Φ
= 1/ COS 27.83 = 1.13