4 1 parallel lines lesson
- 1. Parallel Lines and PlanesParallel Lines and Planes You will learn to describe relationships among lines, parts of lines, and planes. In geometry, two lines in a plane that are always the same distance apart are ____________.parallel lines No two parallel lines intersect, no matter how far you extend them.
- 2. Parallel Lines and PlanesParallel Lines and Planes Definition of Parallel Lines Two lines are parallel iff they are in the same plane and do not ________.intersect
- 3. Parallel Lines and PlanesParallel Lines and Planes Planes can also be parallel. The shelves of a bookcase are examples of parts of planes. The shelves are the same distance apart at all points, and do not appear to intersect. They are _______.parallel In geometry, planes that do not intersect are called _____________.parallel planes Q J K M L S R P Plane PSR || plane JML Plane JPQ || plane MLR Plane PJM || plane QRL
- 4. Parallel Lines and PlanesParallel Lines and Planes Sometimes lines that do not intersect are not in the same plane. These lines are called __________.skew lines Definition of Skew Lines Two lines that are not in the same plane are skew iff they do not intersect.
- 5. Parallel Lines and PlanesParallel Lines and Planes A CB E G H D F Name the parts of the figure: 1) All planes parallel to plane ABF 2) All segments that intersect DH 3) All segments parallel to CD 4) All segments skew to AB Plane DCG AD, CD, GH, AH, EH AB, GH, EF DH, CG, FG, EH