Which pair of undefined terms is used to define a ray?
O line and plane
O plane and line segment
O point and line segment
O point and line
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The correct answer is: O point and line.
A ray is defined in geometry as a line that begins at a certain point (the endpoint) and extends infinitely in one direction. Therefore, both a point (the starting location) and a line (which represents the path extending from that point) are essential undefined terms used in defining a ray. If you have any more questions or need further assistance, feel free to ask!