# How do you evaluate cos 30?

Then teach the underlying concepts
Don't copy without citing sources
preview
?

Write a one sentence answer...

#### Explanation

Explain in detail...

#### Explanation:

I want someone to double check my answer

Describe your changes (optional) 200

2
Alan P. Share
Jan 10, 2017

$\cos \left({30}^{\circ}\right) = \frac{\sqrt{3}}{2}$

#### Explanation:

Consider an equilateral triangle (with interior angles of ${60}^{\circ}$) and sides of length $2$ which has been bisected as in the image below:

By definition $\cos = \text{adjacent side"/"hypotenuse}$

So in this case
$\textcolor{w h i t e}{\text{XXX}} \cos \left({30}^{\circ}\right) = \frac{\sqrt{3}}{2}$

##### Just asked! See more
• 18 minutes ago
• 18 minutes ago
• 18 minutes ago
• 19 minutes ago
• 2 minutes ago
• 3 minutes ago
• 8 minutes ago
• 8 minutes ago
• 12 minutes ago
• 14 minutes ago
• 18 minutes ago
• 18 minutes ago
• 18 minutes ago
• 19 minutes ago