Introduction to Geometry: Points, Lines, and Planes

1
Introduction to Geometry Points, Lines, and
Planes
2
Basic Geometric Figures

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

3
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.

4
Basic Geometric Figures

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

5
Basic Geometric Figures

• Segment Part of a line bounded by two endpoints.

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Basic Geometric Figures

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

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Naming Geometric Figures

• Intersection The point shared by two crossing
  figures.

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Naming Geometric Figures

• Parallel Two lines in the same plane that never
  intersect.
• Represented by symbol (line 1 line2)

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Naming Geometric Figures

• Skew Two or more lines that do not lie in the
  same plane. They are not parallel and do not
  intersect.

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Real Life Example
E

• Find four segments that intersect AC.
• Find three segments to AC.
• Find four segments skew to AC.

A
F
B
FedEx
C
G
D
H