1. Coplanar lines that don't intersect.
Non-coplanar lines that don't intersect.
Planes that don't intersect.
A line that intersects two or more coplanar lines
at different points.

2. Angles that occupy corresponding positions
Angles that lie in between two lines and on opposite sides
of the transversal.
Angles that lie outside two lines and on opposite sides
of the transversal.
(Same Side Interior Angles)
Two angles that lie in between two lines and on the same side
of the transversal.

3. EJ, BG, CH and DI EJ
BC, CD, DE, GH, HI and IJ DE
AB, AE, FG, and FJ AE
ABC

4. JL KJ JN
Plane JKL

5. exactly one
exactly one

6. AB ∥ CD AB Τ AC
is not
Perpendicular AB C
You can't use the Perpendicular Postulate to prove they're
perpendicular, however, you can use deductive reasoning to
show they are. If AB and CD are parallel and AB and AC are
perpendicular, then AC must be perpendicular to CD.

7. Corresponding
Alternate Interior
∠1 and ∠2 are not alternate
exterior angles because they're
a linear pair.
Alternate Exterior
Same Side
Interior
Consecutive Interior

8. ∠3 ∠4 ∠6 ∠6 ∠3 ∠7 ∠7 ∠8 ∠4 ∠1 ∠8 ∠3 ∠6 ∠7 Consecutive/Same Side
∠ ∠ ∠8
∠ ∠ ∠7
Consecutive/Same Side
Interior angles
Alternate Exterior Angles