Prentice Hall Geometry

2-4 Deductive Reasoning

Objective

To use the Law of Detachment and the Law of Syllogism

A Solve It problem demonstrates using deductive reasoning.
Image Long Description

In the Solve It, you drew a conclusion based on several facts. You used deductive reasoning. Deductive reasoning (sometimes called logical reasoning) is the process of reasoning logically from given statements or facts to a conclusion.

Essential Understanding Given true statements, you can use deductive reasoning to make a valid or true conclusion.

To use the Law of Detachment, identify the hypothesis of the given true conditional. If the second given statement matches the hypothesis of the conditional, then you can make a valid conclusion.


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Table of Contents

Prentice Hall Geometry Chapter 1 Tools of Geometry Chapter 2 Reasoning and Proof Chapter 3 Parallel and Perpendicular Lines Chapter 4 Congruent Triangles Chapter 5 Relationships Within Triangles Chapter 6 Polygons and Quadrilaterals Chapter 7 Similarity Chapter 8 Right Triangles and Trigonometry Chapter 9 Transformations Chapter 10 Area Chapter 11 Surface Area and Volume Chapter 12 Circles Skills Handbook Reference Visual Glossary Selected Answers Index Acknowledgments