A necessary step for constructing perpendicular lines through a point on a line is D. Draw arcs on either side of a given point of the line.
A perpendicular line simply means the lines that intersect at 90 degrees.
In this case, a necessary step for constructing perpendicular lines through a point on a line is to draw arcs on either side of a given point of the line. This can be done by opening the compass bans marking two points of intersection between the arcs in a given line.
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