# S1 ACT11.2A Naming Angle Positions

- Author:
- MrWat@SFCC(HK), Tim Brzezinski

- Topic:
- Angles

Definition: A transversal is a line that intersects 2 other lines at 2 distinct points.
In the applet, the dashed line below is a transversal. (Actually, each of the three lines displayed below is a transversal.)
When a transversal intersects 2 other lines, special names are given to certain pairs of angles.
These angle pairs are called

**corresponding angles, alternate angles (**. Explore these angle pairs within the applet below. Then, answer the questions that follow.**interior)**and interior angles (on the**same side of transversal)**Questions:
1) What does the term "same-side" mean in the phrases "same-side interior angles" ?
2) What does the term "alternate" mean in the phrases "alternate interior angles" ?
3) Which of the four displayed angles would be considered "interior" angles? Why is this?
4) How would you describe, in your own words, what it means for a pair of angles to be described as "corresponding angles"?