(i) The sum of an angle and its supplement = 180°.
Therefore supplement of angle 54° = 180° – 54° = 126°
(ii) The sum of an angle and its supplement = 180°.
Therefore supplement of angle 132° = 180° – 132° = 48°
(iii) The sum of an angle and its supplement = 180°.
Therefore supplement of angle 138° = 180° – 138° = 42°