IF GF and CD are perpendicular to AB, one can say that they will or do not intersect each other. But if CD is not perpendicular to AB, GF and CD, do intersect at one (single) point.
What is the relationship about?
In the congruent relationship above, one can say that two lines intersect to create a linear pair of congruent angles, and thus one can say that the lines are perpendicular in nature.
Therefore, in the case above, IF GF and CD are perpendicular to AB, one can say that they will or do not intersect each other. But if CD is not perpendicular to AB, GF and CD, do intersect at one (single) point.
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