# Parallel and Perpendicular Lines

### Example 1

Which of the lines in the figure are parallel? Which is the transversal? |

### Example 2

Which angles are congruent in this figure? |

### Example 3

What is the relationship between ∠1 and ∠3? |

### Example 4

If ∠3 has a measure of 138°, what is the measure of an angle adjacent to ∠1? |