2. Lines that are coplanar and do not intersect.

3. Parallel Lines

4. Planes that do not intersect.

5. Parallel Planes

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

7. Transversal

8. Lines that do not intersect and are not coplanar.

9. Skew Lines

10. If there is a line and a point not on the line, then there is _______ through the point parallel to the given line.

11. exactly one line

12. If there is a line and a point not on the line, then there is _______ through the point perpendicular to the given line.

13. exactly one line

14. Two angles are ___________ if they occupy corresponding positions on the transversal.

15. Corresponding angles

16. Two angles are _________ if they lie between the two lines on opposite sides of the transversal.

17. alternate interior angles

18. Two angles are _________ if they lie between the two lines on the same side of the transversal.

19. Consecutive interior angles

20. Two angles are _________ if they lie outside the two lines on opposite sides of the transversal.

21. alternate exterior angles

22. If two lines intersect to form a linear pair of congruent angles, then the lines are __________.

23. perpendicular

24. If two sides of two adjacent acute angles are perpendicular, then the angles are __________.

25. Complementary

26. If two lines are perpendicular, then they intersect to form ______________________.

27. four right angles

28. Vertical Angles are ____________.

29. Congruent

30. If two parallel lines are cut by a transversal, then the pairs of ________ are congruent.

31. Corresponding angles

32. If two parallel lines are cut by a transversal, then the pairs of ________ are congruent.

33. alternate interior angles

34. If two parallel lines are cut by a transversal, then the pairs of ________ are congruent.

35. alternate exterior angles

36. If two parallel lines are cut by a transversal, then the pairs of ________ are supplementary.

37. Consecutive interior angles

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

39. parallel

40. In a plane, if two lines are perpendicular to the same line, then they are ______________ to each other.

41. parallel

42. The ratio of the vertical change (the rise) to the horizontal change (the run) of a non- vertical line.

43. slope

44. In a coordinate plane, two non- vertical lines are parallel if and only if they have the same ________.

45. slope

46. All vertical lines are __________ and have a slope that is _______________.

47. Parallel, undefined

48. The equation of a line in slope intercept form

49. y = mx + b

50. Vertical and horizontal lines are ____________________.

51. perpendicular

52. In a coordinate plane, two non- vertical lines are perpendicular if and only if the product of their slopes is ______.

54. If a transversal is perpendicular to one of two parallel lines, then it is ___________ to the other.

55. perpendicular