Supplementary angles - two angles that add up to 180
degrees.
No matter how large or small angles 1 and 2 on the left become,
the two angles remain supplementary which means that they add up to
180°.
By the way, supplementary angles do not need to be adjacent
angles(angles next to one another) if it doesnt add up to 180 then
they are not supplementary angles, but if they do then they are
supplementary angles.