Subject: What are adjacent angles that equal 360 called? David Secondary 11th I am a student. I know that supplementary angles add to 180 degrees and that commplementary angles add up to be 90 degrees, but what are adjacent angles that equal 360 degrees called? Hi David,From one point of view, each angle is the negative of the other. From another point of view, two points on a circle determine two arcs; each is called the opposite of the other. I do not recall any official name for the angles those arcs subtend. Chris
