SOLUTION: In triangle XYZ, two angles add to be 100 degrees. What is the measure of the third angle?

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Question 564375: In triangle XYZ, two angles add to be 100 degrees. What is the measure of the third angle?
Answer by ad_alta(240) About Me  (Show Source):
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In Euclidean geometry (but not necessarily non-Euclidean geometry), the angles of a triangle sum to 180. Since two of the angles sum to 100, the third must be 80.