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I need help with this question

I need help with this question-example-1
User Croyd
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the answer is D. since angle 2= 100 that also means angle 3, 6, and 7 will = 100.
when they are nect to each other they have to add to be 180.

angle 6 (100°) + angle 5 (80°) = 180°
User Csupnig
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