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Lesson 8: Angle Properties of
Parallel Lines Intersected by a
Transversal
Unit 4 Lines, Angles, Triangles,
and Quadrilaterals
Key Vocabulary
• Parallel: Lines on the same flat surface
that do not intersect (cross each other)
• Transversal: a line that crosses two or more
lines
Key Vocabulary
Corresponding Angle: the angles in
matching corners when two lines are
crossed by another line (called
the Transversal). If the lines crossed are
parallel the corresponding angles will be
equal.
Key Vocabulary
Alternate Interior Angle: the pairs of
angles on opposite sides of the
transversal but inside the two lines. If the
lines are parallel, these angles will be
equal.
Activity
Work through the investigations provided
on the handout "Separated No Longer"
Notes
•Complete the Angle Relationships
Summary Chart in your notebook
Angle Relationships Summary Chart
Diagram
O
X
O
X
#
*
*
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Description of Angle
Relationships
Name of Angle Type
Angle Relationships Summary Chart
Diagram
X
Description of Angle
Relationships
O
Name of Angle Type
Angle Relationships Summary Chart
Diagram
*
X
O
#
*
#
X
O
Description of Angle
Relationships
Name of Angle Type
Angle Relationships Summary Chart
Diagram
X
O
X
O
Description of Angle
Relationships
Name of Angle Type