Question

How many triangles exist with the given angle measures?

80°, 50°, 50°

Answer 1

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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Answer 2

Just one, because the total degrees that a triangle has to have is 180, so u just add those up and cabam