Conjecture

Counterexample

Conditional Statement

Hypothesis

Conclusion

Truth Value

Negation

Converse

Inverse

Contrapositive

Logically Equivalent Statements

Biconditional Statement

Definition

Polygon

Triangle

Quadrilateral

Proof

Addition Property of Equality

Subtraction Property of Equality

Multiplication Property of Equality

Division Property of Equality

Reflexive Property of Equality/Congruence

Symmetric Property of Equality/Congruence

Transitive Property of Equality/Congruence

Substitution Property of Equality

Theorem

Two-Column Proof