Answer: 60°
Explanation:
I have attached a picture of the unit circle below. The cosine trigonometry function utilizes the hypotenuse and the adjacent side. In the unit circle, the hypotenuse is equal to 1. This means we look to the adjacent side (of the given angle, in this case theta θ), this can also be the x-value in a graph or a coordinate point.
In our unit circle, we see that when x is equal to one-half, the angle is 60 degrees. This gives us an answer of 60 degrees.