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Mathematics 9 Online
OpenStudy (anonymous):

A line is an undefined term because it

OpenStudy (anonymous):

A line is an undefined term because it is an understood truth. In all aspects of math, there must be understood truths. These are the foundations of mathematical concepts. You need to have a foundation to build your understandings and proofs upon. Therefore, a line is just a line. You understand what it is and what it looks like and what makes it up, that is all you need to begin.

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