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Name _______________________________________ Date __________________ Class __________________
LESSON
7-3
Line and Angle Relationships
NOTES
Lines in the same plane that never meet
are called parallel lines.
Two lines that intersect to form right
angles are called perpendicular lines.
Lines that do not intersect and are not
parallel are called skew lines. Skew lines
are in different planes.
Use the figure to complete the statements.


1. AB and DC are ______________________
lines, since they never meet and lie
in the same plane.


2. DH and EH are ____________________
lines, since they intersect to form right
angles.
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
3. AB and EH are ____________________
lines, since they do not intersect and
are not parallel.
Adjacent angles have a common vertex and a common side,
but no common interior points. Angles 2 and 3 in the diagram
are adjacent. Adjacent angles formed by two intersecting lines
are supplementary.
Vertical angles are the opposite angles formed by two intersecting lines.
Angles 1 and 3 in the diagram are vertical angles. Vertical angles have
the same measure, so they are congruent.
Name ________________________________________ Date___________________ Class _________________
A transversal is a line that intersects two or more lines. Transversals to parallel lines form
special angle pairs.
Opposite sides of transversal
Opposite sides of transversal
Same sides of transversal
Inside the parallel lines
Outside the parallel lines
Same relative position
Congruent angles
Congruent angles
Congruent angles
Line n || line p. Find the measure of each angle.
m1 = ______
m2 = ______
m3 = ______
m4 = ______
m5 = ______
m6 = ______
m7 = ______