What are the coordinates of the terminal point determined by t = 10π/3? The available answers are A. (1/2, - √3,2) B. (1/2, √3/2) C. (-1/2, - √3/2) D. (-1/2, √3/2)

Question

What are the coordinates of the terminal point determined by t = 10π/3? The available answers are  A. (1/2, - √3,2)  B. (1/2, √3/2) C. (-1/2, - √3/2) D. (-1/2, √3/2)

hartnn · Answer

can you find cos t and sin t ?

anonymous · Answer

I am not sure.
I don't know where to start.

hartnn · Answer

co-ordinates are (cos t,sin t)
so whats cos(10 $\pi$/3)=?

anonymous · Answer

.9833?

hartnn · Answer

nopes, how did u get that?

anonymous · Answer

eh.....I used a calculator and put that in T.T

hartnn · Answer

but for your calculator should be in radian mode...but it actually was in degree mode, thats why u didn't get correct answer

anonymous · Answer

Oh thank you ..why shuld i be in radian mode tho....Can i know that?

hartnn · Answer

if u can use calculator, then u get cos(10pi/3) = -0.5 
and sin(10pi/3) =-0.866
so the co-ordinates will be ??
it should be in radian mode because the angle given is in radians

anonymous · Answer

So it should be C?
Oh so thats why