The explanation for that question is the following:]
Note that the required angle (FGH) is in the second quadrant, and a circle has a full round of 2π, so whatever the measure of that angle is, it should be added to 2π(x) + π where x is the number of rounds.
Thus, to save time and get the correct choice. The value you'll always get from the given expression is always going to be an odd value multiplied by π
Therefore, any odd number is correct for that question
13π
31π
47π
etc .....
Hope it's clear on everyone's side
If its not, feel free to direct message any of the team members we would be glad to help
I hope everyone chose the correct choice
Best of luck
@kharezmi
