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Parallel lines do not meet and so do not form angles.
You cannot calculate interior angles in a polygon. You can only calculate their sum. The sum of all the interior angles of an n-sided polygon is (n-2)*180 degrees. So for example, the interior angles of a triangle (n = 3) sum to 180 degrees. But the individual angles can be (1,1,178), or (30,60,90) or infinitely many other combinations.
Record how long they are first.
It will have 2 pairs of equal angles that add up to 360 degrees
invers tangent(slope)