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Triangles have to have 180 degrees because every polygon must have the degrees by this formula:

(N-2)*180 = degrees, where N stands for the number of sides. If we subtract 3 from 2, we get 1, and multiplied by 180 gives us 180 degrees. This is true for every polygon.

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12y ago
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Q: Why do triangles have to have 180 degrees?
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