6.3 Basic Facts About Parallel Planes Objective: After studying this section, you will be able to recognize lines parallel to planes, parallel planes,

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6.3 Basic Facts About Parallel Planes Objective: After studying this section, you will be able to recognize lines parallel to planes, parallel planes, skew lines and use properties relating parallel lines and planes.

Definition A line and a plane are parallel if they do not intersect. m A B Two planes are parallel if they do not intersect m n

In the diagram below the planes are parallel but the lines are not because A, B, C, D do not determine a plane. These lines are called skew. m n B C A D DefinitionTwo lines are skew if they are not coplanar, are not parallel, and do not intersect.

TheoremIf a plane intersects two parallel planes, the lines of intersection are parallel. B C A D m n s

Properties Relating Parallel Lines and Planes 1. If two planes are perpendicular to the same line, they are parallel to each other. 2. If a line is perpendicular to one of two parallel planes, it is perpendicular to the other plane as well. 3. If two planes are parallel to the same plane, they are parallel to each other. 4. If two lines are perpendicular to the same plane, they are parallel to each other. 5. If a plane is perpendicular to one of two parallel lines, it is perpendicular to the other line as well.

Given: Prove: m n C D B A

Summary In your own words, describe what the word “skew” means Homework: worksheet 6.3