To identify the correct diagram for the first step in the construction of a perpendicular bisector, you would typically be looking for a diagram that shows the following steps:
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Two Points: The diagram should show a line segment defined by two endpoints, let's call them point A and point B.
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Compass Usage: The next step usually involves placing the compass point on one of the endpoints (either A or B) and drawing an arc above and below the line segment. Then, you would repeat the process for the other endpoint.
If you have access to specific diagrams, the one that prominently displays this initial action of drawing arcs from both endpoints of the segment would be the answer. This arc drawing is crucial as it leads to the placement of intersections which will eventually define the perpendicular bisector. If you have any diagrams or specific images to analyze, I can help clarify further!