**1. Are alternate angles always equal?**

Only if the two lines are parallel.

**2. If there are three parallel lines, are corresponding angles still equal?**

Yes, it does not matter how many parallel lines there are.

**3. What is the name of the line that crosses two parallel lines called?**

The

transversal.

**4. Can co-interior angles ever be equal?**

Yes, and they would both be 90

°.