The pair of the line together that could be perpendicular to RS and should be considered will be EA and FG.
It should be noted that in terms of elementary geometry, two geometric objects should be considered as perpendicular when they intersect at a right angle.
In such a case, a line is treated to be perpendicular to another line in the case when the two lines intersect at a right angle.
Therefore, based on the information, the pair of the line together that could be perpendicular to RS and should be EA and FG.
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