Need urgent help with angles and radians?! 10 points.

I need to know how to convert angles to radians.
I got the solution, but the answer is still different, not sure if that needs to be converted aswell.

An example question is; convert angles to radians.
1. 105°
2. 225°

I used for 1. 105/180 x pi. The answer was 1.83259571459405 on the calculator.
But the final answer is suppose to be 7pi/12. How do I change that into 7pi/12?

And how can I do this without a calculator?
Is it same for no.2?

Thanks