Answer :
The pair of the line together that could be perpendicular to RS and should be considered will be EA and FG.
What is a perpendicular line?
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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