Question

which is precisely defined using the undefined terms point and plane? circle line segment perpendicular lines ray

Explanation:

1. Analyze the definition of each option:

• 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 uses the undefined terms point (for the center and the points on the circle) and plane (where the circle lies).
• A line segment is defined using two points (its endpoints), not a plane.
• Perpendicular lines are defined based on the angle (90 degrees) between two lines, which are defined using points, but not a plane in their basic definition.
• A ray is defined using a point (its endpoint) and a direction (using another point), not a plane.

Answer:

A. circle