1. 3.1 Identify Pairs of Lines and Angles

2. Parallel Lines Have the same slope Can be contained in the same plane Are everywhere the same distance apart

3. Parallel

4. Skew Lines Non intersecting Non parallel Can not be contained in the same plane

5. Skew

6. Perpendicular

7. Transversal A line that intersects two or more coplanar lines at different points

8. Postulates If there is a line and a point not on the line, then there is exactly one line through the point that will be parallel to the line If there is a line and a point not on the line, then there is exactly one line through the point that will be perpendicular to the line

9. Angle Positions Relative to Two Lines

10. Angles formed by transversals Alternate interior Alternate exterior Corresponding Consecuitive

11. Alternate interior angles = lie between the lines on opposite sides of the transversal Alternate Exterior = lie outside the lines on opposite sides of the transversal Corresponding = angles having corresponding positions Consecutive = lie between the lines on the same side of the transversal

12. Alternate Interior Angles

13. Alternate Exterior Angles

14. Consecutive Angles

15. Corresponding Angles