1.

Which pair of angles are complementary?

A. \[\operatorname{y}{}^\circ , \left( 180 - y \right){}^\circ \]       
B. \[\operatorname{x}{}^\circ , \left( 90 + x \right){}^\circ \]
C. \[\operatorname{x}{}^\circ , \left( 90 - x \right){}^\circ \]    
D. \[63{}^\circ , 37{}^\circ \]
E. None of these
Answer» D. \[63{}^\circ , 37{}^\circ \]


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