Question

Choose the point on the terminal side of -210°. Please only answer this question if you are willing to show work so I can learn how you got your answer!

Answer 1

X=rcos∅=r cos (-210)=r cos 210=rcos (180+30)=-r cos 30
$x=-r* \frac{sqrt 3}{2} = \frac{- sqrt 3r}{2} ,$
$y=r sin (-210)=-rsin 210=-rsin (180+30)=-r(-sin 30)$
1$or y=r sin 30=r* \frac{ 1}{2} = \frac{r}{2}$