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JonHenderson55
Answer:  ONE (1) triangle exists ;  
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{ since there are THREE (3) angles in ONE TRIANGLE; and all THREE (3) angles in ANY triangle must add up to 180° ;  and the three given measurements:  80° + 50° + 50° = 180°; precisely }.
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Samdog3191
Just one, because the total degrees that a triangle has to have is 180, so u just add those up and cabam

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