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Honors Geometry Section 3.1
Transversals & Special Angle Pairs
A transversal is a line which
intersects two coplanar lines at
different points.
In the figure below,
line ____ is a
transversal.
c
When you have a transversal, there
are four types of special pairs of
angles that are formed.
Corresponding angles are two angles
in the same position relative to the
two lines and the transversal.
1 & 5
4 & 6
2 & 8
3 & 7
Same-side interior angles are two
angles on the same side of the
transversal and between the two lines.
2 & 5
3 & 6
Alternate interior angles are two
angles on opposite sides of the
transversal and between the two lines.
2 & 6
3 & 5
Alternate exterior angles are two
angles on opposite sides of the
transversal and outside the two lines.
1 & 7
4 & 8
Examples: Classify each pair of angles as one of
the types above or write “none”.
alt. ext.
none
Examples: Classify each pair of angles as one of
the types above or write “none”.
corr.
ss - int.
Examples: Classify each pair of angles as one of
the types above or write “none”.
alt. ext.
none
Example: Name all angles in the figure that
could correctly complete each statement.
18
30
10
a) 1 and _____
are
alternate exterior angles
20
18
26
b) 21 and _____
are
same - side interior angles