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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

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โˆ™ 2011-10-19 13:55:00
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Q: What is the difference between a defined and an undefined term in Geometry?
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What is an undefined term in geometry?

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.


How are undefined terms and defined terms relate to each other?

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


What is psycho geometry?

Psycho-Geometry is defined as measurement of the earth together with consciousness of the reciprocal relationship between man and the objects of the environment and between the objects themselves.- Dr.MARIA MONTESSORI


Is point an undefined term?

Point is not an undefined term. It can be defined as a mathematically precise location, or as the place where two lines intersect.


Why it is called undefined terms in geometry?

In geometry, definitions are formed using known words or terms to describe a new word. There are three words in geometry that are not formally defined. These three undefined terms are point, line and plane.POINT (an undefined term)In geometry, a point has no dimension (actual size). Even though we represent a point with a dot, the point has no length, width, or thickness. A point is usually named with a capital letter. In the coordinate plane, a point is named by an ordered pair, (x,y).LINE (an undefined term)In geometry, a line has no thickness but its length extends in one dimension and goes on forever in both directions. A line is depicted to be a straight line with two arrowheads indicating that the line extends without end in two directions. A line is named by a single lowercase written letter or by two points on the line with an arrow drawn above them.PLANE (an undefined term)In geometry, a plane has no thickness but extends indefinitely in all directions. Planes are usually represented by a shape that looks like a tabletop or wall. Even though the diagram of a plane has edges, you must remember that the plane has no boundaries. A plane is named by a single letter (plane m) or by three non-collinear points (plane ABC).Undefined terms can be combined to define other terms. Noncollinear points, for example, are points that do not lie on the same line. A line segment is the portion of a line that includes two particular points and all points that lie between them, while a ray is the portion of a line that includes a particular point, called the end point, and all points extending infinitely to one side of the end point.Defined terms can be combined with each other and with undefined terms to define still more terms. An angle, for example, is a combination of two different rays or line segments that share a single end point. Similarly, a triangle is composed of three noncollinear points and the line segments that lie between them.Everything else builds on these and adds more information to this base. Those added things include all the theorems and other "defined" terms like parallelogram or acute angle.

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