Question

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

Explanation:

Step1: Analyze each option

• Angle: An angle is formed by two rays (a ray is defined using point and line) with a common endpoint (a point). But it is not directly defined just by point and line.
• Circle: A circle is defined as the set of all points in a plane that are at a given distance (radius) from a given point (center). It involves a plane (another undefined term in geometry) along with point.
• Parallel lines: Parallel lines are defined as two lines in a plane that do not intersect. It involves a plane (another undefined term in geometry) along with line.
• Ray: A ray is a part of a line that starts at a point (endpoint) and extends infinitely in one direction. It is directly defined using the undefined terms point and line.

Answer:

ray