Correct Answer: line segment
Explanation:
Step 1: Understand what an undefined term is in geometry
In geometry, certain fundamental terms are called undefined terms. These are terms that do not have a formal definition but are understood through examples, descriptions, and intuitive concepts.
Step 2: Recognize the three main undefined terms
These are considered undefined because they are the building blocks of geometric definitions and cannot be defined using simpler terms.
Step 3: Why is a line undefined?
Step 4: Eliminate incorrect options
Correct Explanation:
A line is an undefined term because it has no formal definition and must be understood through intuitive meaning rather than using previously defined terms.
Final Answer: line segment (as part of the reasoning, though the question is conceptual)
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