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Parallel lines are equidistant from one another
When two lines intersect, the angles across from each other are called vertically opposite angles, or just opposite angles. Opposite angles are equal to one another. See 'related links' below.
They are lines that intersect one another at 90 degree angles.
If the product is -1 then the lines are perpendicular to one another.
There are infinitely many pairs of numbers whose difference is equal to the sum of 538 and 259 (which is 797). One such pair is 420 and 1217. Another pair is 0 and 797.