Verified answer

answer is in Quad III at π/3 below the x axis... thus the total angle is 180 + 60 = 240 deg

the terminal point is ( cos 4π/3 , sin 4π/3 ) = ( - 1/2 , - sqrt (3 ) / 2 )

[ eg... ref angle is π/3 in Q III so both answers are neg. ]

you need to memorize the basic angles x and y values for 0, 30, 45, 60, 90 , 180, 270 [ and what each angle is in rad form ]....then know your signs for each quadrant, and then how to convert an angle in any quadrant down to it's reference angle.

I'm sure you have or will cover all this in class.