Two angles are supplementary if their sum is 180 degrees. Since angles 1 and 2 are supplementary, then
angle 1 + angle 2 = 180
If angle 1 = angle 2, then,
If angle 1 = angle 2 = 180/2 = 90
90 degrees is a right angle
Thus,
angle 1 and angle 2 are right angles
