Answer:
The answer is angle 2.
Explanation:
The sum of two supplementary angles is 180 degrees (which is a straight line). If you add angles 4 and 2, it forms a straight line.
I hope this helped! :-)
C angle 2
Supplementary angles add to 180 degrees (or form a straight line)
The angles that form a straight line line angle 4 are either 2 or 3
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