DEPRECATED Radians on the unit circle


The following graph contains a clock whose radius is 1 unit. The radii that intersect 8 o'clock and 10 o'clock are highlighted, and so is the arc between them.
The lengths of the arcs between consecutive numbers on the clock are each equal to start fraction, 1, divided by, 12, end fraction of the circle.
What is the radian measure theta of the angle formed by the two highlighted radii? Give an exact expression.
space, theta, equals