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