If (angle)A and (angle)B are supplementary, and m(angle)A = 57°, what is m(angle)B?
1 answer:
Answer:
123°
Step-by-step explanation:
Supplementary angles add up to be 180 degrees.
This means angles A and B will add up to be 180 degrees.
We can find the measure of angle B by subtracting 57 from 180
180 - 57
= 123
So, the measure of angle B is 123 degrees
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