By the definition of perpendicular lines, EA and FG is the pair of lines perpendicular to RS.
This question is incomplete without a figure. Find the figure attached with the answer.
From the figure attached,
Measure of angles between the lines EA, FG and RS are 90°.
And the definition of the perpendicular lines states that if the angle between two lines is 90°, lines are said to be perpendicular.
Therefore, EA and FG are the lines perpendicular to RS.
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