(i) The sum of an angle and its complement = 90°
Therefore, the complement of 20° = 90° – 20° = 70°
(ii) The sum of an angle and its complement = 90°
Therefore, the complement of 35° = 90° – 35° = 55°
(iii) The sum of an angle and its complement = 90°
Therefore, the complement of 90° = 90° – 90° = 0°
(iv) The sum of an angle and its complement = 90°
Therefore, the complement of 77° = 90° – 77° = 13°
(v) The sum of an angle and its complement = 90°
Therefore, the complement of 30° = 90° – 30° = 60°