The 3 interior angles of any triangle add up to 180 degrees
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An interior angle is any angle on the interior of the triangle.
Any angle between 0 and 360 degrees. An interior angle of any polygon (other than a triangle) can have any value in that range.
How: The sum of the 3 interior angles of any triangle add up to 180 degrees
Any exterior angle of a triangle always equals the sum of the two interior opposite angles.
Either could have a larger interior angle. If they were regular, then the interior angle of a triangle would be 60 degrees whereas that of a heptagon would be 128.57 degrees. The REGULAR heptagon would have a larger interior angle than a REGULAR triangle.