alleryIf one angle measures $57^{\circ}$, what is its supplement?
A$123^{\circ}$
B$33^{\circ}$
C$147^{\circ}$
D$237^{\circ}$
Answer & Solution
Correct answer: A. $123^{\circ}$
Supplementary angles add up to $180^{\circ}$.
**So the supplement is $180^{\circ}-57^{\circ}=123^{\circ}$.**
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