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The 3 interior angles in any triangle always add up to 180 degrees. This is true for Euclidean geometry (i.e. geometry on a flat surface) which is what most people will always deal with. Non-Euclidean geometry is concerned with geometry that isn't on a flat plane such as the globe and is used mostly in advanced physics and mathematics such as in the general theory of relativity.

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Q: Do all triangles add up to 180?
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