Question

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

Explanation:

• Angle: An angle is formed by two rays (a ray is a part of a line with one endpoint). A ray is defined using a point (the endpoint) and a line (the direction of the ray). So, an angle is defined using the undefined terms 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 does not directly use the concept of a line in its basic definition in the same fundamental way as an angle.
• Parallel lines: Parallel lines are defined as two lines in a plane that do not intersect. While lines are involved, the definition of parallel lines does not rely on the concept of a point in the same direct manner as the definition of an angle (where the vertex of the angle is a point).
• Ray: A ray is a part of a line that has one endpoint. But the question is about a term defined using both point and line. A ray is more about a line with a point (endpoint), while an angle combines two rays (using lines and points at their vertices) in a more complex geometric relationship.

So, the term defined using the undefined terms point and line is an angle.

Answer:

A. angle