Hi again!

I have an exam coming up where you need to understand radians (which I do). But I would like to know if there is a good way to see what angles are expressed in fractions. I'll give an example.

In radians,arcsin(0,5)=~0,524. If you divide pi by this the answer is 6, so an accurate way is to answerarcsin(0,5)=pi/6.

But the angle could also bepi - pi/6. Is there a fast way of seeing what the fraction equal to this is?