Find the Exact Value of an Angle

new question

Determine α.

Choose your answer!

0

False

Determine the exact angle

α

of the blue arc,

α∈(-π,π)

.

Some points on the circle are marked that have an integer radian measure. Recall that adding any multiple of

2π

to an angle measure yields the same point on the unit circle. Red lines highlight a symmetry that may help determine the blue angle.