Find the measure of an angle with measure between 0 and 360 that is conterminal with an angle measuring -800

Add 720 degrees (which represents two full revolutions around the center) to -800.  Result:  -80 degrees.  This angle is in Quadrant IV.

Subtracting 80 from 360 will give you a positive angle co-terminal with -800 deg.  360 - 80 = ?

Xis -1/2
y is 35/4.