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(i) We know that,

Sum of measures of complementary angles is 90^o

It is given in the question that,

Angle = 20^o

Therefore,

Complement = 90^o – 20^o

= 70^o

(ii) We know that,

Sum of measures of complementary angles is 90^o

It is given in the question that,

Angle = 63^o

Therefore,

Complement = 90^o – 63^o

= 27^o

(iii) We know that,

Sum of measures of complementary angles is 90^o

It is given in the question that,

Angle = 57^o

Therefore,

Complement = 90^o – 57^o

= 33^o