There is no logical conjecture that can be made for what could be an irregular polygon with an unknown number of sides.
Of course, you could always conjecture anything. For example, that they will taste of strawberries. A conjecture that, I guess, will be disproved quite easily.
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The exterior angle of a triangle is equal to the sum of the two opposite interior angles. So if a triangle had points A, B and C: The exterior angle at B would equal the sum of interior angles at A and C. Similarly, the exterior angle at C would equal the sum of interior angles at A and B And the the exterior angle at A would equal the sum of interior angles at C and B.
if you were smart you would know
The sum of the exterior angles of any polygon is always 360 degrees. In a 19-sided polygon, each exterior angle would be 360/19 = 18.9474 degrees. Therefore, the sum of the exterior angles of a 19-sided polygon would be 19 * 18.9474 = 360 degrees.
The exterior angles of a pentagon, or of any polygon, add to 360 degrees. Note, however, that exterior angles are not the same as the angles outside. One would think that each pair of interior and exterior angles add to 360 degrees. Instead, they sum to 180.
The sum of the exterior angles cannot be 1980 degrees - it is always 360 degrees.