To identify which diagram represents a step in constructing a perpendicular line that is not a perpendicular bisector, we need to consider the descriptions of each image.
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The first image shows a solid line segment and a dashed vertical line segment that is perpendicular to it, intersecting it at a point not at the midpoint. This represents a construction of a perpendicular line without bisecting the segment.
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The second image discusses a compass needle on point A with the pencil placed two-thirds of the way along segment AB, but it does not mention creating a perpendicular line.
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The third image describes arcs being drawn and intersecting at points above and below the midpoint, with a line drawn through these intersections to form a right angle at the midpoint. This represents the construction of a perpendicular bisector.
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The fourth image mentions a compass needle on point B with the pencil placed two-thirds of the way along segment AB, similar to the second image and does not indicate construction of a perpendicular line.
Based on the descriptions, the first image represents a step in constructing a perpendicular line that is not a perpendicular bisector.