An exterior angle of a triangle can have a value between (but not including) 0 to 180 degrees.
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An exterior angle of a triangle is equal in measure to the sum of the other two interior angles.
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The exterior sum of the angles of any polygon including a triangle is always 360 degrees.
The interior angles of a triangle add up to 180 degrees. The exterior angles of a triangle add up to 360 degrees.
the exterior angle theorem