ANY triangle MUST add up to 180 degrees.
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Exterior angles add up to 360 degrees Interior angles add up to 2340 degrees
The interior angles add up to 17640 degrees
The interior angles add up to 1080 degrees.
All Triangles add up to 180 degrees, no matter if it is Right or Scalene or ANY TRIANGLE!! If it does not, it is not a triangle!
The interior angles of a 13 sided polygon add up to 1980 degrees