To define a line segment, we need the following undefined terms:Step 2/51. Point: A point is a basic element in geometry that has no size or dimension. It is represented by a dot and is used to define other geometric objects.Step 3/52. Line: A line is a straight path that extends infinitely in both directions. It is made up of an infinite number of points and has no thickness or width.Show all stepsAnswer4. Line Segment: A line segment is a part of a line that is bounded by two distinct endpoints. It has a definite length and can be measured. Therefore, the undefined terms needed to define a line segment are point, line, endpoint, and line segment.