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Geometric Terms. 7 Math: Sections 7-1 and 7-2. A. B. C. D. A. X. Y. Lines and Planes. Point - indicates a location in space. Line - A series of points that extend forever in both directions. Ray - A part of line that goes forever in one direction.

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geometric terms
Geometric Terms
  • 7 Math: Sections 7-1 and 7-2
lines and planes

A

B

C

D

A

X

Y

Lines and Planes
  • Point - indicates a location in space.
  • Line - A series of points that extend forever in both directions.
  • Ray - A part of line that goes forever in one direction.
  • Segment - A part of a line that is between 2 endpoints.
plane
Plane
  • A flat surface that extends indefinitely in all directions and has no thickness.
      • A piece of paper is like a plane that you write on.
      • What are some other planes in the classroom?
types of lines
Types of Lines
  • Intersecting Lines - Have exactly one point in common because they meet one time.
  • Parallel Lines - Are in the same plane and never intersect.
  • Skew Lines - Lie in different planes, and never intersect and are not parallel.
practice naming line segments
Practice Naming Line Segments
  • Name a pair of intersecting segments.
  • Name a pair of parallel segments.
  • Name a pair of skew segments.
angles
Angles
  • An angle is formed by 2 rays with a common endpoint.
    • Vertex - is the point of intersection of the 2 rays.
  • Name with Angle Sign, followed by 3 capital letters with the vertex in the middle.
types of angles
Types of Angles
  • Acute: Between 0 and 90 degrees.
  • Right: 90 degrees
  • Obtuse: between 90 and 180 degrees
  • Straight: 180 degrees
pairs of angles
Pairs of Angles
  • Complementary: Pairs of angles whose sum is 90 degrees
  • Supplementary: Pairs of angles whose sum is 180 degrees
  • Adjacent: Share a vertex and a side
  • Vertical: Formed by 2 intersecting lines and are opposite each other (in the X)
  • Congruent: Have equal measures
identifying angles
Identifying Angles
  • Obtuse
  • Acute
  • Straight
  • Right
identifying angles1
Identifying Angles
  • Complementary
  • Supplementary
  • Vertical
  • Adjacent