# How do you find the exact value of cos^-1(1/2)?

Aug 21, 2016

60 degrees

#### Explanation:

${\cos}^{-} 1$ (1/2)
means the angle whose cosine is $\frac{1}{2}$

Draw an equilateral triangle , cut it in half,: the ratio of the sides

is 1:2:$\sqrt{3}$

The angle whose cosine is $\frac{1}{2}$ is 60 degrees.