Find each missing angle below. Estimate your answers to one decimal place.

Question

anonymous · Answer

|dw:1355758308245:dw|

anonymous · Answer

$$\cos(\alpha)=\frac{12}{30}=\frac{2}{5}$$ is a start

anonymous · Answer

then a calculator to compute 
$$\cos^{-1}(\frac{2}{5})$$ will finish it

anonymous · Answer

okay, what does the little fish symbol thingy mean?

anonymous · Answer

oh i thought that is what you used 
it is the greek letter "alpha" $\alpha$

anonymous · Answer

the variable is of course unimportant.
the answer is $\cos^{-1}(\frac{2}{5})$

anonymous · Answer

Okay. Thank you very much. So the answer I'm getting is .2 which isn't right so i'm missing something....

anonymous · Answer

two possibilities
one is the "degree vs radian" issue

anonymous · Answer

the other is i made a mistake 
are you supposed to answer in degrees or in radians?

anonymous · Answer

degrees i think

anonymous · Answer

anonymous · Answer

looks like 66.4 degrees about

anonymous · Answer

or 66.42

anonymous · Answer

yeah thats the answer, so the .2 answer is in radians and the 66.4 is in degrees?