Name: ______________________________________________
Date: _________________________
Parallel Lines Worksheet
Label angles according to the diagram below:
If parallel lines are horizontal, label:
If parallel lines are vertical, label:
In the space provided:
 Sketch your diagram.
 Label your angles 1,2,3,4,5,6,7 and 8 in order according to the diagrams
above.
 Measure your angles using the angle tool in Geogebra.
 Write the measurements on your diagram.
1. How can you determine if two lines are Parallel?
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2. How many angles are formed by the transversal line? _______
3. Fill out the following chart:
Word
a.
Corresponding Angles
b.
Alternate Interior Angles
c.
Alternate Exterior Angles
d.
Consecutive Interior
Angles (Same Side Interior
Angles)
Description
List of Angles
Conclusion
Parallel Lines Worksheet – Answer Key
1. How can you determine if two lines are Parallel?
Suggested Answer: Two lines are parallel if they have the same slopes.
2. Label each angle, how many angles are formed by the transversal line? ___8___
3. Fill out the following chart:
Word
Description
List of Angles
Conclusion
a.
Corresponding
Angles
Angles 1 and 5
Angles 2 and 6
Angles 3 and 7
Angles 4 and 8
They are
congruent
b.
Alternate Interior
Angles
If two parallel lines are
cut by a transversal,
then the pairs of
corresponding angles
are congruent.
If two parallel lines are
cut by a transversal,
then the pairs of
alternate interior
angles are congruent
Angles 3 and 6
Angles 4 and 5
They are
congruent
c.
Alternate Exterior
Angles
If two parallel lines are Angles 1 and 8
cut by a transversal,
Angles 2 and 7
then the pairs of
alternate exterior
angles are congruent
They are
congruent
d.
Consecutive
Interior Angles
(Same Side
Interior Angles)
If two parallel lines are Angles 3 and 5
cut by a transversal,
Angles 4 and 6
then the pairs of
consecutive interior
angles are
supplementary
They measure
180 degrees.