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GEOMETRY
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CHAPTER2.8Y
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à 2.8èTheorems ë Remember
äèPlease prove ê followïg statements or show that êy
are not universally true by counterexample.
â
èèèèèèèèèCongruence ç angles is transitive.
éS In this chapter we have developed ê techniques å skills
necessary ë write geometric proçs.èWe now have three undefïed terms,
twenty-seven defïitions, fifteen axioms, å many êorems that we can
use ë justify statements ï geometric proçs.èEach time we prove a
êorem we can add that new fact ë our ëtal ïvenëry.
è Some ç ê most useful êorems proven ï this chapter are ïcluded
ï ê followïg list.
Theorem 2.8.1èIf a = b å c = d, ên a + c = b + d.
èProç: The proç is given ï ê Details ç Section 2.2
Theorem 2.8.2èIf a = b å c = d, ên ac = bd
èProç: The proç is given ï Problem 1 ç Section 2.2
Theorem 2.8.3èCogruence ç segments is reflexive, symmetric, å
èèèèèèè transitive
èProç: The proç is given ï Problems 6 å 7 å ê Details ç
èèèè Section 2.6
Theorem 2.8.4èIf ░╕ å ╣╡ ïtersect at P, ên ╬APB å ╬BPC are
èèèèèèè supplementary
èProç: The proç is given ï ê Details ç Section 2.7
Theorem 2.8.5èSupplements ç congruent angles are congruent
èProç: The proç is given ï Problem 1 ç Section 2.7
Theorem 2.8.6èSupplements ç an angle are congruent
èProç: The proç is given ï Problem 2 ç Section 2.7
Theorem 2.8.7èComplements ç congruent angles are congruent
èProç: The proç is given ï Problem 3 ç Section 2.7
Theorem 2.8.8èComplements ç an angle are congruent
èProç: The proç is given ï Problem 4 ç Section 2.7
Theorem 2.8.9èVertical angles are congruent
èProç: The proç is given ï Problem 5 ç Section 2.7
Theorem 2.8.10èCongruence ç angles is reflexive, symmetric, å
èèèèèèèètransitive
èProç: The proç is given ï Problems 1, 2, å 3 ç Section 2.8
1èPlease prove ê given statement is true or show that it is
èèèèè not universally true by counterexample.
èèèèèèèèèèèèTheorem:è╬A ╧ ╬A
èèèèèèè A)èTrue by deductive proçèèè
èèèèèèè B)èNot universally true by counterexample
ü
èèè Theorem:è╬A ╧ ╬A
èèèè Proç:èStatementèèèèèèèReason
èèèèèèèè 1. m╬A = m╬Aèèèèè 1. Reflexive axiom ç equality
èèèèèèèè 2. ╬A ╧ ╬Aèèèèèè 2. Defïition ç congruence
Ç A
2èPlease prove ê given statement is true or show that it is
èèèèè not universally true by counterexample.
èèèèèèèèè Theorem:èIf ╬A ╧ ╬B, ên ╬B ╧ ╬A
èèèèèèè A)èTrue by deductive proçèèè
èèèèèèè B)èNot universally true by counterexample
üèTheorem:èIf ╬A ╧ ╬B, ên ╬B ╧ ╬A
èèèèèProç:èStatementèèèèèèèReason
èèèèèèèèè1. ╬A ╧ ╬Bèèèèèè 1. Given
èèèèèèèèè2. m╬A = m╬Bèèèèè 2. Defïition ç congruence
èèèèèèèèè3. m╬B = m╬Aèèèèè 3. Symmetric axiom ç equality
èèèèèèèèè4. ╬B ╧ ╬Aèèèèèè 4. Defïition ç congruence
Ç A
3èPlease prove ê given statement is true or show that it is
èèèèè not universally true by counterexample.
èèèèè Theorem:èIf ╬A ╧ ╬B å ╬B ╧ ╬C, ên ╬A ╧ ╬C
èèèèèèè A)èTrue by deductive proçèèè
èèèèèèè B)èNot universally true by counterexample
ü Theorem: If ╬A ╧ ╬B å ╬B ╧ ╬C, ên ╬A ╧ ╬C
èèèè Proç: StatementèèèèèèèReason
èèèèèèèè1. ╬A ╧ ╬B, ╬B ╧ ╬Cèè1. Given
èèèèèèèè2. m╬A = m╬B åèèè 2. Defïition ç congruence
èèèèèèèèè m╬B = m╬C
èèèèèèèè3. m╬A = m╬Cèèèèè 3. Transitive axiom ç equalities
èèèèèèèè4. ╬A ╧ ╬Cèèèèèè 4. Defïition ç congruence
Ç A
èèèèèèèèèèè