Points, Lines, & Line Segments Rays & Angles

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Points, Lines, Line SegmentsRays Angles
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Points, Lines and Planes
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Line Segment
A
B

• A Line Segment consists of points A B and all
  of the points between B A.
• Denoted or .

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Line
A series of points that go through points A B
and goes endlessly in both directions. This line
could also be called
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Ray
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An angle is formed by 2 rays with the same
endpoint, called the vertex.

• An angle may be named in one of three ways
• 1. 2.
• 3.

A
CAB
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Angle
X
Y
Z
You can name the angle above ?Y, ?XYZ, or ?ZYX
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Congruent Figures

• Plane figures that have both the same size and
  shape are called congruent figures.

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Similar Figures

• Plane figures that have the same shape are called
  similar figures.

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Similar
The same shape, but not always the same size.
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Two lines are parallel if they do not intersect.
EX1 Are the lines parallel?
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When two lines intersect at right angles,
-

• They are called perpendicular lines.

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Skew Lines
Skew lines lie in different planes. They are
neither parallel nor intersecting.
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Language of Geometry