Answer:
(i) Complement of the angle \[\text{2}{{0}^{o}}=\text{9}{{0}^{o}}-\text{ 2}{{0}^{o}}=\text{7}{{0}^{o}}\] (ii) Complement of the angle \[\text{6}{{\text{3}}^{o}}=\text{9}{{0}^{o}}-\text{6}{{\text{3}}^{o}}=\text{2}{{\text{7}}^{o}}\] (iii) Complement of the angle \[\text{5}{{\text{7}}^{o}}=\text{ 9}{{0}^{o}}-\text{ 5}{{\text{7}}^{o}}=\text{ 3}{{\text{3}}^{o}}\]
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