Which pair of angles must be supplementary?
A vertical line comes out of a horizontal line. A diagonal line goes through the 2 lines to form 5 angles. From top left, clockwise, the angles are 2 (90 degrees), 1, 5, 4, 3.
Angle 1 and Angle 5
Angle 5 and Angle 3
Angle 4 and Angle 5
Angle 4 and Angle 1
