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**1. **Geometry Chapter 2 Terms

**2. **Axiom Also known as a postulate.
A statement that describes a fundamental relationship between the basic terms of geometry.

**3. **Biconditional The conjunction of a conditional statement and its converse.

**4. **Compound Statement A statement formed by joining two or more statements.

**5. **Conclusion In a conditional statement, the statement that immediately follows the word then.

**6. **Conditional Statement A statement that can be written in if-then form.

**7. **Conjecture An educated guess based on known information.

**8. **Conjunction A compound statement formed by joining two or more statements with the word and.

**9. **Contrapositive The statement formed by negating both the hypothesis and conclusion of the converse of a conditional statement.

**10. **Converse The statement formed by exchanging the hypothesis and conclusion of a conditional statement.

**11. **Counterexample An example used to show that a given statement is not always true.

**12. **Deductive Argument A proof formed by a group of algebraic steps used to solve a problem.

**13. **Deductive Reasoning A system of reasoning that uses facts, rules, definitions, or properties to reach logical conclusions.

**14. **Disjunction A compound statement formed by joining two or more statements with the word or.

**15. **Formal Proof Also known as a two-column proof.
Contains statements (each step) and reasons (properties that justify each step) organized in two columns.

**16. **Hypothesis In a conditional statement, the statement that immediately follows the word if.

**17. **If-then Statement A compound statement of the form “if A, then B”, where A and B are statements.

**18. **Inductive Reasoning Reasoning that uses a number of specific examples to arrive at a plausible generalization or prediction. Conclusions arrived at by this lack the logical certainty of those arrived at by deductive reasoning.

**19. **Informal Proof Also known as a paragraph proof.
For this type you write a paragraph to explain why a conjecture for a given situation is true.

**20. **Inverse The statement formed by negating both the hypothesis and conclusion of a conditional statement.

**21. **Law of Detachment Also known as a postulate.
A statement that describes a fundamental relationship between the basic terms of geometry.

**22. **Law of Syllogism Also known as a postulate.
A statement that describes a fundamental relationship between the basic terms of geometry.

**23. **Logically Equivalent Also known as a postulate.
A statement that describes a fundamental relationship between the basic terms of geometry.

**24. **Negation Also known as a postulate.
A statement that describes a fundamental relationship between the basic terms of geometry.

**25. **Paragraph Proof Also known as a postulate.
A statement that describes a fundamental relationship between the basic terms of geometry.

**26. **Postulate Also known as a postulate.
A statement that describes a fundamental relationship between the basic terms of geometry.

**27. **Proof Also known as a postulate.
A statement that describes a fundamental relationship between the basic terms of geometry.

**28. **Related Conditionals Also known as a postulate.
A statement that describes a fundamental relationship between the basic terms of geometry.

**29. **Statement Also known as a postulate.
A statement that describes a fundamental relationship between the basic terms of geometry.

**30. **Theorem Also known as a postulate.
A statement that describes a fundamental relationship between the basic terms of geometry.

**31. **Truth Table Also known as a postulate.
A statement that describes a fundamental relationship between the basic terms of geometry.

**32. **Truth Value Also known as a postulate.
A statement that describes a fundamental relationship between the basic terms of geometry.

**33. **Two-Column Proof Also known as a postulate.
A statement that describes a fundamental relationship between the basic terms of geometry.