front 1 Inductive reasoning  back 1 reasoning that uses a number of specific examples to arrive at a conclusion

front 2 conjecture  back 2 a concluding statement reached using inductive reasoning

front 3 counterexample  back 3 a false example to how that a conjecture is not true

front 4 statement  back 4 a sentence that is either true or false

front 5 truth value  back 5 that of a statement in which is true or false

front 6 negation  back 6 of a statement that has the opposite meaning, as well as the opposite value

front 7 compound statement  back 7 two or more statements joined by the word and or or

front 8 conjunction  back 8 a compound statement using the word and; only true when both statements that form it are true

front 9 disjunction  back 9 a compound statement that uses the word or

front 10 truth table  back 10 used to determine truth values of negations and compound statements

front 11 conditional statement  back 11 a statement that can be written in ifthen form

front 12 ifthen statement  back 12 the form of if p, then q

front 13 hypothesis  back 13 the phrase immediately following the word if

front 14 conclusion  back 14 the phrase immediately following the word then

front 15 related conditionals  back 15 statements based on a given conditional statement

front 16 converse  back 16 formed by exchanging the hypothesis and conclusion of the conditional

front 17 inverse  back 17 formed by negating both the hypothesis and conclusion

front 18 contrapositive  back 18 formed by negating both the hypothesis and conclusion of the converse of the conditional

front 19 logically equivalent  back 19 statements with the same truth values

front 20 deductive reasoning  back 20 uses facts, rules definitions, or properties to reach logical conclusions from given statements

front 21 postulate  back 21 a statement that is accepted as true without proof

front 22 axiom  back 22 a statement that is accepted as true without proof

front 23 proof  back 23 a logical argument in which each statement you make is supported by a statement that is accepted as true 
front 24 theorem  back 24 a statement or conjecture that has been proven; can be used as a reason to justify statements in other words

front 25 deductive argument  back 25 formed by a logical chain of statements linking the given to what you are trying to prove

front 26 paragraph proof  back 26 a paragraph explaining why a conjecture for a given statement is true 
front 27 informal proof  back 27 a paragraph explaining why a conjecture for a given statement is true 
front 28 algebraic proof  back 28 a proof that is made up of a series of algebraic statements

front 29 twocolumn proof  back 29 contains statements and reasons organized in two columns

front 30 formal proof  back 30 contains statements and reasons organized in two columns

front 31 Ruler Postulate  back 31 The points on any line or line segment can be put into one to one correspondence with real numbers. 
front 32 Segment Addition Postulate  back 32 If A, B, and C are collinear, then point B is between A and C if and only if AB + BC = AC. 
front 33 Reflexive Property of Congruence  back 33 AB is congruent to AB 
front 34 Symmetric Property of Congruence  back 34 If AB is congruent to CD, then CD is congruent to AB 
front 35 Transitive Property of Congruence  back 35 If AB is congruent to CD and CD is congruent to EF, then AB is congruent to EF. 
front 36 Protractor Postulate  back 36 Given any angle, the measure can be put into one to one correspondence with real numbers between the numbers 0 and 180 
front 37 Angle Addition Postulate  back 37 m<ABD + m<DBC = m<ABC 
front 38 Supplement Theorem  back 38 If two angles form a linear pair, then they are supplementary angles

front 39 Complement Theorem  back 39 If the noncommon sides of two adjacent angles form a right angle, then the angles are complementary angles

front 40 Congruent Supplements Theorem  back 40 Angles supplementary to the same angle or to congruent angles are congruent

front 41 Congruent Complements Theorem  back 41 Angles complementary to the same angle or to congruent angles are congruent.

front 42 Vertical Angles Theorem  back 42 If two angles are vertical angles then they are congruent

front 43 Right Angle Theorems  back 43 Perpendicular lines intersect to form four right angles

front 44 Right Angle Theorems  back 44 All right angles are congruent

front 45 Right Angle Theorems  back 45 Perpendicular lines form congruent adjacent angles

front 46 Right Angle Theorems  back 46 If two angles are congruent and supplementary, then each angle is a right angle

front 47 Right Angle Theorems  back 47 If two congruent angles form a linear pair, then they are right angles
