Which method would allow you to prove that all seven long diagonal lines are parallel?
-Measure the corresponding angles where the lines intersect the border. If the angles are congruent, the lines are parallel.
-Draw a diagonal connecting the opposite corners. If it makes an angle of 45º with each long diagonal, the long diagonals are parallel.
-Count the number of tick-marks on each diagonal. Diagonals with the same number of tick-marks are parallel.
-The seven long diagonals are clearly not parallel

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