An A/C is in a level turn, at a constant TAS of 300Kts and a bank angle of 45 degrees. It's turning radius is:
A, 9000
B, 2381
C, 3354
D, 4743
The equation that you require is:
Turn Radius = V squared / gTanAOB
To get radius in meters you need to convert the TAS from Kts into m/sec by multiplying it by 0.515
If you use g = 10 m/sec squared this gives:
Radius = (300 x 0.51)squared / (10 x TAN 45)
Radius = 2387 m
This is closest to option B.