Which pair of angles must be supplementary? 50 POINTS!!! 2 lines intersect to form right angles. Another line goes through the lines diagonally to form 6 angles. From top left, clockwise, the angles are 2 (90 degrees), 1, 6, 5 (90 degrees), 4, 3. Angle 1 and Angle 6 Angle 2 and Angle 5 Angle 5 and Angle 4 Angle 6 and Angle 2