1. Undefined Terms (Point, Line or Plane)
2. Subsets of a Line
3. Angles
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1. Undefined Terms (Point, Line or Plane)
2. Subsets of a Line
3. Angles
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In Geometry, we have several undefined terms: point, line and plane. From these three undefined terms, all other terms in Geometry can be defined. In Geometry, we define a point as a location and no size. A line is defined as something that extends infinitely in either direction but has no width and is one dimensional while a plane extends infinitely in two dimensions.