Match the angles that are greater than 90° with their reference angles.

Reference angles:

30

60

90

45

Angles greater than 90:

135

240

270

330

For angles in first quadrant, the reference angle is itself. In second quadrant, the equation would be 180 - x where x is the measure of the angle. In third quadrant, x - 180. Lastly, in the fourth quadrant, the reference angle is 360 - x. From the second set of angles in the given, the reference angles are.

(1) 135; RA = 180 - 135 = 45

(2) 240; RA = 240 - 180 = 60

(3) 270; RA = 90 (lies in the y - axis)

(4) 330; RA = 360 - 330 = 30