The exterior sum of the angles of any polygon including a triangle is always 360 degrees.
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The sum of the angles should equal 180
An exterior angle of a triangle is equal in measure to the sum of the other two interior angles.
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The Interior angles of a triangle add up to 180° The Exterior angles of a triangle (or any other polygon) add up to 360°.
The sum of the exterior angles of a polygon is 360o.