Answer :

(i) 45°


Let, measure of an angle = X


Complement of X = 90° – X


Hence,


X = 90° – X


2X = 90°


X = 45°


Therefore measure of an angle = 45°


(ii) 90°


Let, measure of an angle = X


Supplement of X = 180° – X


Hence,


X = 180° – X


2X = 180°


X = 90°


Therefore measure of an angle = 90°


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