1. Section 1-3: Segments, Rays, Parallel Lines and Planes Goal 2.02: Apply properties, definitions, and theorems of angles and lines to solve problems

2. Essential Question What are the characteristics of parallel lines and planes and skew lines?

3. between A point R is between S and T iff (if and only if) – a. R, S, and T are distinct and collinear – b. SR + RT = ST

4. segment segment AC, denoted AC or CA, consists of points A and C and all points between A and C

5. ray ray AC, denoted AC, consists of AC and all other points P such that C is between A and P. The endpoint of ray AC is A, the point named first. (The arrow must be on the right end of the segment bar.)

6. opposite rays AC and AB are opposite rays iff A is between B and C. (This means A, B, and C must be collinear.) *Note: Opposite rays must have the same endpoint.

7. parallel lines coplanar lines that do not intersect (Use  as the symbol for the word parallel. Indicate lines are parallel by drawing a corresponding number of arrows on the parallel lines somewhere on the line other than the endpoint of the segment drawn.)

8. skew lines noncoplanar lines that do not intersect

9. parallel planes planes that do not intersect

10. Examples: page 19: 5 – 7 5.) Name all the labeled segments. 6.) Name all the labeled rays. 7.) a. Name a pair opposite rays with T as an endpoint. b. Name another pair of opposite rays. R S T W

11. Examples: p 19: 11, 14, 17 – 20 E B D F A C 11.) AC 14.) AC 17.) parallel planes 18.) parallel lines 19.) skew lines 20.) a line and a plane that are parallel

12. Classwork Independently do p. 20 (21 – 35) [10 minutes] Go Over Pairs do p. 20 (37 – 47) Finish compare answer with another pair

13. Ticket out the door 1.) How are parallel and skew lines alike? 2.) How are they different?

14. Homework Textbook: p 23 (71 – 85 all) Workbook: Practice 1-3