Question

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

Explanation:

To solve this, we analyze each option:

• Angle: Defined by two rays with a common endpoint (not using just point and line directly).
• Circle: Defined as the set of points equidistant from a center (uses distance, not just point and line).
• Parallel lines: Lines in a plane that never meet (definition involves relationship between lines, not built from point and line as a basic definition).
• Ray: A ray is defined as a part of a line that starts at a point (the endpoint) and extends infinitely in one direction. So it uses the undefined terms point and line.

Answer:

D. ray (assuming the options are labeled A: angle, B: circle, C: parallel lines, D: ray)