Introduction to Geometry: Points, Lines, and Planes

Basic Geometric Figures Point: Location in space represented by a dot and a capital letter. Points have no size, only position. Example:

Basic Geometric Figures Line: Connected series of points that extends in both directions without end (represented by arrows). Lines can be named by any two points on the line, or by one lowercase letter.

Basic Geometric Figures Plane: Infinite set of points forming a flat surface extending in all directions, represented by a four-sided figure. Example:

Basic Geometric Figures (Aspence) SPACE—is 3 -D SPACE— the set of all points.

Basic Geometric Figures Segment: Part of a line bounded by two endpoints.

Basic Geometric Figures Ray: Part of a line that starts at a certain (end)point and continues forever in one direction.

Naming Geometric Figures Intersection: The point shared by two crossing figures.

Real Life Example E A F 1. Find four segments that intersect AC. B 2. Find three segments || to AC. Fed. Ex 3. Find four segments skew to AC. G H C D

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