what is cos 240 degrees as a fraction?

Question

luigi0210 · Answer

You mean as a radian?

anonymous · Answer

is that what I mean? lol this stuff is confusing.

anonymous · Answer

-1/2 or -0.5

anonymous · Answer

yeah I guess how do I turn it into a radian or something.

luigi0210 · Answer

To get it in radians multiply by $\frac{\pi}{180}$

anonymous · Answer

is that the formula for any degree, to find radian? you always multiply by pi/180?

luigi0210 · Answer

Yea, to get from degree ---> Radians.

luigi0210 · Answer

Radians --> degree is different tho.

anonymous · Answer

oh okay, but actually I think it has to  be a fraction... cause the answer is -1/2. I just don't know how to obtain that answer on my own.

luigi0210 · Answer

Oh, crap I didn't see the cos infront (－‸ლ)

luigi0210 · Answer

Look at this unit circle: http://etc.usf.edu/clipart/43200/43215/unit-circle7_43215_lg.gif Look for 240 degrees, the ordered pairs are (x, y)---> (cos, sin), so look for the x/

anonymous · Answer

I don't use unit circles .

luigi0210 · Answer

Then use a triangle >_>

anonymous · Answer

I'm confused do I have to use that to figure out the fraction of cos 240 degrees .... or is there a formula?

aa123 · Answer

luigi0210 · Answer

No, just use the triangle, unit circle, or once you're experience enough just your head.