(i) The given angle is 54°.

Since, the sum of an angle and its supplement is 180° .

its, supplement will be 180° - 54° = 126°

(ii) The given angle is 132°.

Since, the sum of an angle and its supplement is 180° .

its, supplement will be 180° - 132° = 48°

(iii) The given angle is 138°.

Since, the sum of an angle and its supplement is 180° .

its, supplement will be 180° -138° = 42°