over lesson 2–6 5-minute check 5 a.reflexive property b.symmetric property c.substitution property...
TRANSCRIPT
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Over Lesson 2–6
A. Reflexive Property
B. Symmetric Property
C. Substitution Property
D. Transitive Property
State the property that justifies the statement. If BC = CD and CD = EF, then BC = EF.
BELL RINGER PROBLEM
You do not necessarily need to put this in your notes, but be prepared
to give your answer and your reasoning
behind why you chose your answer.
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You wrote algebraic and two-column proofs.
• Write proofs involving segment addition.
• Write proofs involving segment congruence.
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Use the Segment Addition Postulate
You will use each of the following (not necessarily in this order):
GivenReflexive Property of Equality
Substitution Property of EqualityTransitive Property of Equality
Definition of Congruent Segments (used twice)Segment Addition Postulate (used twice)
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Use the Segment Addition Postulate
2. Definition of congruent segments
AB = CD2.
3. Reflexive Property of EqualityBC = BC3.
4. Segment Addition PostulateAB + BC = AC4.
Proof:Statements Reasons
1. 1. GivenAB CD___ ___
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6. Segment Addition PostulateCD + BC = BD6.
7. Transitive Property of EqualityAC = BD7.
Proof:Statements Reasons
5. Substitution Property of Equality
5. CD + BC = AC
Use the Segment Addition Postulate
8. Definition of congruent segments
8. AC BD___ ___
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1. GivenAC = AB, AB = BX1.
2. Transitive PropertyAC = BX2.
3. GivenCY = XD3.
4. Addition PropertyAC + CY = BX + XD4.
AY = BD 6. Substitution6.
Proof:Statements Reasons
Which reason correctly completes the proof?
5. ________________AC + CY = AY; BX + XD = BD
5. ?
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A. Addition Property
B. Substitution
C. Definition of congruent segments
D. Segment Addition Postulate
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Proof Using Segment Congruence
BADGE Jamie is designing a badge for her club. The length of the top edge of the badge is equal to the length of the left edge of the badge. The top edge of the badge is congruent to the right edge of the badge, and the right edge of the badge is congruent to the bottom edge of the badge. Prove that the bottom edge of the badge is congruent to the left edge of the badge.
Given:
Prove:
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Proof Using Segment Congruence
5. Substitution5.
Proof:Statements Reasons
1. Given1.
2. Definition of congruent segments
2.
3. Given3.
4. Transitive Property4. YZ___
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Prove the following.
Given:
Prove:
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Which choice correctly completes the proof?
Proof:Statements Reasons
1. Given1.
2. Transitive Property2.
3. Given3.
4. Transitive Property4.
5. _______________5. ?
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A. Substitution
B. Symmetric Property
C. Segment Addition Postulate
D. Reflexive Property
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HW: (2-7) Worksheet
Remember: You have a QUIZ on Friday
over 2-6 & 2-7