1. Lesson 3 – 1 Parallel Lines and Transversals
Geometry
Lesson 3 – 1
Parallel Lines and Transversals
Objective:
Identify the relationships between two lines or two planes.
Name angle pairs formed by parallel lines and transversals.

2. Parallel Lines
Parallel lines
Coplanar lines that do not intersect.

3. Parallel Planes
Parallel Planes
Planes that do not intersect.

4. Skew Lines
Skew lines
Lines that do not intersect and are not coplanar.

5. Identify each of the following.
All segments parallel to JP
A segment skew to KL
A plane parallel to plane PQR

6. Identify each of the following.
All segments skew to BC
A segment parallel to EH
All planes parallel to plane DCH
Plane ABG

7. Transversal Transversal
A line that intersects two or more coplanar lines at two different points.

8. You must memorize these relationships! Interior angles Exterior angles
Consecutive angles
Alternate interior angles
Alternate exterior angles
Corresponding angles
You must
memorize these
relationships!

9. Corr. Alt. Ex. Cons. Int. Alt. Int.
Classify the relationship between each pair of angles as alternate interior, alternate exterior, corresponding, or consecutive interior angles.
Either
write out
the full word(s)
or use these
abbreviations.
Corr.
Alt. Ex.
Cons. Int.
Alt. Int.

10. Alt Ex. Alt. Int. Corr. Cons. Int.
Classify the relationship between each pair of angles as alternate interior, alternate exterior, corresponding, or consecutive interior angles.
Either
write out
the full word(s)
or use these
abbreviations.
Alt Ex.
Alt. Int.
Corr.
Cons. Int.

11. Corr.
Cons. Int.
Alt. Ex.
Alt. Int.

12. Transversal: h Alt. Ex. Transversal: k Cons. Int. Transversal: Corrs.
Identify the transversal connecting each pair of angles in the photo. Then classify the relationship between each pair of angles.
Transversal: h
Alt. Ex.
Transversal: k
Cons. Int.
Transversal:
Corrs.

13. Is c a transversal?
No, because it does not intersect at 2 points.

14. Quiz tomorrow over memorizing angle relationships!
Homework
Pg – 12 all, 14 – 42 E
Quiz tomorrow over memorizing angle relationships!