Please answer the question

Question

Given a || c and b || c, draw a conclusion about a and b.

1. perpendicular
2. congruent
3. lines
4. parallel
5. angles

a and b are-------- , because if two------------  are-----------  to the same line, then they are---------  to each other.

Answer 1

If two lines are parallel to the same line, they are parallel to each other.

Answer 2

This is a theorem straight out of the text book.