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-210 means start at the x-axis and go clockwise 210 degrees
|dw:1441116254558:dw|

i know that but i dont know where to go from there

210 is 30 "past" 180, so we can draw this triangle
|dw:1441116408316:dw|

how did you get one for the radius

is it just always assumed

so how would i get the answer from that

is it\[(-\sqrt{3}, 1)\]

do you know the lengths of the sides of a 30-60-90 triangle if you know the hypotenuse is 1?

more generally, do you know about sin, cos ?

yes i know about that but im just so confused how you got the 2 sides in the first place

i just tried to find the 3rd side too and i dont think its right

does this make sense so far?

yes it does thank you

so let's say we have this triangle
|dw:1441117338853:dw|

do you know the sin 30º ?

which is 0.5?

you mean the coordinates?

how do we find x then

what is the definition of cosine ?

adj/hyp

yes, and in this special case where we set the hyp=1
we have
cos theta= adjacent

notice the adjacent side is the distance along the x-axis

do i use the pythagorean theorem

we could, but we could use
cos 30 = x
people generally memorize this value

what would that equal

also, drill into your head the idea that
cos = x
sin = y
(for a UNIT circle)