Complementary angles are angles that add up to 90°.
eg 1 40° and 50° are complementary angles. (40 + 50 = 90)
eg 2 The complement of 20° is 70°. (20 + 70 = 90)
Supplementary angles are angles that add up to 180°.
eg 1 140° and 40° are supplementary angles. (140 + 40 = 180)
eg 2 The supplement of 100° is 80°. (100 + 80 = 180)