What is the measure of an angle that turns through one-twelfth (1/12) of a circle?

Well u have a circle and you cut it into 12 parts.
that means that each sector will have 3 angles.
so you would take the first sector which is 90 degrees and divide it by 3.
you would get each angle being at 30 degrees.

>>so 1/12 of a circle would be >> 30 degrees

hope this helps
remember if you ever need anything or need a question answered feel free to post it on my profile or you can message me...