# Angles A and B are supplementary. If mangle A= 78° what is mangle B?

Question
Transformation properties
Angles A and B are supplementary.
If $$\displaystyle{m}\angle{A}={78}°\ {w}\hat{{i}}{s}\ {P}{S}{K}{m}\angle{B}?$$

2020-11-28
The measures of supplementary angles add up to 180∘. So if $$\displaystyle{m}\angle{A}={78}∘$$, then the measure of angle B must be $$\displaystyle{m}\angle{B}={180}∘−{m}\angle{A}={180}∘−{78}∘={102}∘$$

### Relevant Questions

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