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# Check all that apply. pi/4 is the reference angle for Download png

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Reference angle is the angle formed by the terminal side of teh angle and the horizontal line or the x-axis. The reference angles in the different quadrants can be determined using the formula below:Quadrant 1: RF = real angleQuadrant 2: RF = real angle 90 angle = real - pi/2Quadrant 3: RF = real angle of 180 = current angle piQuadrant 4 : RF = real angle of 270 = actual angle of 3/4 piThe first thing to do is to determine the quadrant of each angle and then apply the formula:. 19 pi /4 = 855 deg = 2 Q = 135 + 45 = 180 (correct)b. 15 pi/4 = 675 gr = 4a P = 315 + 45 = 360 (correct)c. 7 pi/4 = 315 gr = 4a P = 315 + 45 = 360 (correct)d. 12 pi/4 = 540 gr = x-axis = no correctAnswers are a, B, and C.