Q: What undefined terms are needed to define a line segment?

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Line, plane

None of them.

The difference between defined and undefined terms is that the defined terms can be combined with each other and with undefined terms to define still more terms. These are undefined terms: 1.plane 2.point 3.line These are defined terms: 1.ray 2.union of sets 3.space 4.subset 5.set 6.proper subset 7.opposite rays 8.postulate 9.betweenness of points 10.bisector of a segment 11.midpoint of a segment 12.line segment 13.lenght of a segment 14.collinear points 15.complement of a set 16.coplanar points 17.disjoint sets 18.element 19.empy set 20.finite set 21.geometry 22.infinite set 23.intersection of sets

It is a very basic concept which cannot be defined. Undefined terms are used to define other concepts. In Euclidean geometry, for example, point, line and plane are not defined.

"Defined items" are defined in terms of "undefined terms".

Related questions

Line, plane

"Defined items" are defined in terms of "undefined terms".

yes

None of them.

The difference between defined and undefined terms is that the defined terms can be combined with each other and with undefined terms to define still more terms. These are undefined terms: 1.plane 2.point 3.line These are defined terms: 1.ray 2.union of sets 3.space 4.subset 5.set 6.proper subset 7.opposite rays 8.postulate 9.betweenness of points 10.bisector of a segment 11.midpoint of a segment 12.line segment 13.lenght of a segment 14.collinear points 15.complement of a set 16.coplanar points 17.disjoint sets 18.element 19.empy set 20.finite set 21.geometry 22.infinite set 23.intersection of sets

They are undefined because they can't be described without using words that are themselves undefined. For example a point has no dimensions. It is a location, or position. But if you describe it that way you have to define location or position. You can't define backwards infinitely, so we accept the meanings of these things as intuitively clear without definitions because they are the building blocks of geometry and are needed to define much more complex terms.

I am prepared to define any term in geometry. If there is some term for which you would like to have a definition, just ask.

the three terms; point, line and plane can be defined although it is called the undefined terms still we know and we can define the meanings of that terms.. common sense? joke.

Yes. Even though those terms are left undefined, they are used together with ordinary words to define other geometric terms.

It is a very basic concept which cannot be defined. Undefined terms are used to define other concepts. In Euclidean geometry, for example, point, line and plane are not defined.

The three undefined terms are the point,the line and the plane.

"Defined items" are defined in terms of "undefined terms".