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I chose problem 11 on the chapter 6.3 homework for my source because it is a proof that uses parallel lines and planes

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I chose the first problem from chapter 6.3 homework for my source because I thought it showed many relationships between parallel lines and parallel planes

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I chose this source because it gave basic theorems about lines that are perpendicular to planes

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I chose this source because it gave good illustrations and examples of how lines are perpendicular to planes

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Parallel and Perpendicular Lines and Planes

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Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.

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I chose this source because it stated two postulates concerning planes and lines

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In geometry, the point-line-plane postulate is a collection of assumptions ( axioms) that can be used in a set of postulates for Euclidean geometry in two ( plane geometry), three ( solid geometry) or more dimensions.

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I chose this source because it clearly stated the four ways to prove a plane

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I chose this source because it clearly explained what a plane is

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except that the paper itself is not a plane, because it has thickness! And it should extend forever, too.