Zoetropes 6

To do my last Zoetrope, I split the circle into 12 segments. The main reason for doing this is that it can be done with the compass as I do not have a protractor.

However, I do know trigonometry and it occured to me that I know 360 degrees divded by 15 is 24 degrees. If one creates a triangle within the circle with 24 degrees at the centre of the circle, the other two angles have to be 78 degrees. By utilising the Sine Rule, I can get the measurement needed to split the circle into 15 segments.

Set my compass to said measurement to divide the circle up into accurate segments.