AnswersA. CostelloWCA 5324 Geometry 1st Nine Weeks 26-27Introduction to Proof

Introduction to Proof Answers

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1
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A horizontal line has points D, B, C. A line extends vertically from point B to point A.

Question illustration
A
m∠ABD = m∠ABC
B
AB ≅ BC
C
B is the midpoint of DC.
D
m∠DBC = 90°
2
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Given that RT ≅ WX, which statement must be true?

A
RT + TW = WX + TW
B
RT = 2(RX)
C
WX = 2(RX)
D
RT + TW = RX
3

A paragraph proof

A
uses inductive reasoning to prove a statement.
B
contains a table with a logical series of statements and reasons.
C
uses a visual chart of the logical flow of steps needed to reach a conclusion.
D
contains a set of sentences explaining the steps needed to reach a conclusion.
4

4 lines are shown. One line contains points F, E, A. 3 lines come out of point E. One line goes to point D, another line goes to point B, and another line goes to point C. Angles B E C and B E A are congruent.

Question illustration
A
∠DEF is a right angle.
B
m∠DEA = m∠FEC
C
∠BEA ≅ ∠BEC
D
bisects ∠AEF.
Option D
5

Which statement is true about the given information?

Question illustration
A
BD = BC
Option A
B
BC = BE
Option B
C
BD ≅ CE
D
BC ≅ BD
6

Which statement is true about the given information?

Question illustration
A
BD = BC
Option A
B
BC = BE
Option B
C
BD ≅ CE
D
BC ≅ BD
7

4 lines are shown. One line contains points F, E, A. 3 lines come out of point E. One line goes to point D, another line goes to point B, and another line goes to point C. Angles B E C and B E A are congruent.

Question illustration
A
∠DEF is a right angle.
B
m∠DEA = m∠FEC
C
∠BEA ≅ ∠BEC
D
bisects ∠AEF.
Option D
8

[BLANK]

A
segment addition property
B
angle addition postulate
C
reflexive property
D
transitive property
9

A horizontal line has points D, B, C. A line extends vertically from point B to point A.

Question illustration
A
m∠ABD = m∠ABC
B
AB ≅ BC
C
B is the midpoint of DC.
D
m∠DBC = 90°
10

A paragraph proof

A
uses inductive reasoning to prove a statement.
B
contains a table with a logical series of statements and reasons.
C
uses a visual chart of the logical flow of steps needed to reach a conclusion.
D
contains a set of sentences explaining the steps needed to reach a conclusion.

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