Bell work

1. Bell work Describe some real world examples of parallel lines.

2. 1-3: Segments, Rays , Parallel Lines and Planes • Many geometric figures, such as squares and angles, use only the parts of lines called segments and rays.

3. 1.Yes; the segments have the same endpoints and contain the same points between them. 2. No; they have different endpoints and continue in different directions

4. Opposite Rays • Two collinear rays with the same endpoint. They always form a line

5. Q P L • Name 4 different rays in the figure below. LP QL PQ PL Name two opposite rays. PL and PQ

6. Parallel Lines • Coplanar lines that do not intersect.

7. Name all the segments shown that are parallel to • A. DC B. GJ C. AE AD, EF, BC, HI DF AB, GH, JI Skew lines do not lie in the same plane. They are not parallel and they do not intersect Ex: AB and HI

8. Parallel Planes • Planes that do not intersect Parallel Planes Intersecting Planes

9. Think about this! • Air traffic controllers keep eastbound and westbound airplanes from colliding by having them cruise at different altitudes. The airplanes thus pass each other in ____________. Parallel planes

10. 1.Suppose two parallel planes A and B are each intersected by a third plane C. What do you think will be true of the intersection of planes A and C and the intersection of planes B and C? Give an example within this classroom. • 2. List four pairs of parallel planes in this classroom. • 3. The term skew is from a Middle English word meaning “to escape.” Explain why this might be an appropriate origin for the word that names skew lines.

11. Lesson Quiz

12. Real Quiz • Homework • Worksheet