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8th grade math please help.

Use the diagram that I attached below to complete this sentence:
Angle 2 and angle _____ are supplementary angles.

Also it would help me a lot if you explain why angle ____ is the correct answer!

8th Grade Math Please Help Use The Diagram That I Attached Below To Complete This Sentence Angle 2 And Angle Are Supplementary Angles Also It Would Help Me A Lo class=