What does the words "exterior" and "interior" point to?
Difference: One theorem measures angles on the outside of the lines and the other one measures angles between the lines. Similarities: Both measure angles on opposite sides of the transversal. Both measure angles that are congruent.
Practice makes perfect
There are two main similarities. Both theorems look at angles that lie on opposite sides of a transversal and both theorems measure angles that are congruent. The difference lies in the words "exterior" and "interior". The Alternate Exterior Angles Theorem consider angles that are on the outside of the two lines. We see an example of this below.
The Alternate Interior Angles Theorem considers angles that are between the two lines. We see an example of this below.
