Complementary angle = \(90\degree\)- given angle
(i) Complement of \(20\degree = 90\degree - 20\degree = 70\degree\)
(ii) Complement of \(63\degree = 90\degree - 63\degree = 27\degree\)
(iii) Complement of \(57\degree = 90\degree - 57\degree = 33\degree\)
Read more: Supplementary and Complementary Angles