which is defined using the undefined terms point and line? angle circle parallel lines ray

The figure that is defined using the undefined terms point and line is a ray.

Direct answer

A ray is defined as a part of a line that starts at a single point (called the endpoint) and extends infinitely in one direction along that line.

Why the other choices are not correct

• Angle
  An angle is formed by two rays that share a common endpoint, so its definition depends on rays, not just directly on point and line.

• Circle
  A circle is the set of all points in a plane that are a fixed distance from a given center point, so its definition uses the idea of distance and plane, not just point and line.

• Parallel lines
  Parallel lines are lines in the same plane that never intersect and remain the same distance apart, so the definition also relies on the concepts of plane and distance.

So among the options “angle, circle, parallel lines, ray,” the correct choice is ray.

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