Undefined Terms in Geometry

Points, Line and Planes

1. U ndefined Terms in G eometry

2. Undefined Terms Words that do not require formal definition. In Geometry, there are three undefined terms.

3. Undefined Terms Point Line Plane

4. Point A point has no dimension or actual size. Thus, it has no length, no width and no height (thickness).

5. Point A point is usually named with a capital letter. A B C D

6. Point We can associate point to our real-life. Example: Stars at night Point of a pen

7. Line A line has infinite length, no width and no height and it extends to one dimension only.

8. Line A line is named by a single lowercase script letter, or by any two (or more) points which lie on the line. l A B AB

9. Line Line can also be exhibited to real-life situation. Example: Body of a pencil Curtain Rod

10. Plane A plane has two dimension and it extends indefinitely in all directions. It has infinite length, infinite width and zero height.

11. Plane A plane is named by a single letter (plane m) or by three coplanar points, but not non-collinear point. m x y z Plane m Plane XYZ

12. Plane We can also identify plane to real-life object. Example: Top of a table Book Cover

13. assignment In a one whole sheet of a yellow paper, draw three real –life objects which exhibit the three undefined terms in Geometry.

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