Find the measure of each numbered angle
2 answers:
Answer:

Step-by-step explanation:
Given : 
To Find : 
Solution:
Linear pair : A linear pair is a pair of adjacent, supplementary angles.
So, 




Hence 
<1 + <2 =180 it is a straight line
<1 + 57 =180
subtract 57 from both sides
<1=180 -57
<1 = 123 degrees
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