Directions: use the image to you answer the questions in the portfolio.
part a
a map shows the layout of four city streets. the streets have the following properties:
• north street, center street, and south street are parallel to each other.
• main street intersects the other three streets. answer the following questions:
1. what is the measure, in degrees, of ∠1? show or explain how you got your answer.
2. what is the measure, in degrees, of ∠2 ? show or explain how you got your answer.

3. what is the measure, in degrees, of ∠3? show or explain how you got your answer.

part b
suppose that two additional streets, elm street and oak street, are added to the map. the streets have the following properties:
• elm street is perpendicular to main street.
• elm street is also perpendicular to oak street.
what is the relationship of the lines that represent main street and oak street? explain your reasoning.