Which pair of undefined terms is used to define a ray?

Step 1: Define the Problem

Identify the key components of the question that need to be addressed: Determine which pair of undefined terms is used to define a ray in geometry.

Step 2: Break Down the Problem

Divide the problem into smaller, manageable parts:

• Understand what a ray is in geometric terms.
• Identify the undefined terms commonly used in geometry.

Step 3: Apply Relevant Concepts

Use appropriate academic theories or formulas to solve each part of the problem:

• In geometry, a ray is defined as a part of a line that starts at a point and extends infinitely in one direction.
• The undefined terms in geometry typically include "point" and "line."

Step 4: Analysis, Verify and Summarize

Analyze each part in detail if necessary, carry out the calculations by steps. Verify the calculations result and summarize the findings:

• A ray is defined using the terms "point" and "line." A point indicates the starting position of the ray, and the line represents the path it follows infinitely.

Final Answer

The pair of undefined terms used to define a ray is "point" and "line."