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Which is angle 1 and which is 6 and where are all the others?
zero
A vertical angle is perpendicular to a horizontal base and equals 90 degrees
Say angle 1 is 40 which means that if angle 3 is congruent then angle 3 is also 40 by definition of vertical angles. That would make angle 2 equal to 140 by definition of a linear pair and so angle 4 is congruent by vertical angles.
Because if they werent, they would eventually form an angle.