Chapter 3: Parallel Lines and Triangles
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3.1 Lines in Space3.2 Parallel Lines and TransversalsParallel Lines and TransversalsThis site defines parallel lines and crossing lines and all of the resulting angles. 3.3 Proving Lines ParallelParallel Lines and TransversalsThis site defines parallel lines and crossing lines and all of the resulting angles. 3.4 The Triangle Sum TheoremTriangle Sum TheoremThis site has a demonstration that the sum of the interior angles of a triangle equals 180 degrees. 3.5 Inequalities in GeometryTriangle InequalitiesThis site gives two theorems that deal with triangle inequalities. Triangle InequalitiesThis site shows examples to help students understand triangle inequalities. 3.6 The Triangle Inequality TheoremTriangle InequalitiesThis site gives two theorems that deal with triangle inequalities. Triangle InequalitiesThis site shows examples to help students understand triangle inequalities. |