AnswersWCA - GEOMETRY AIntroduction to Proof

Introduction to Proof Answers

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1
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Name the three different types of proofs you saw in this lesson. Give a description of each.

Answer:

The three types of proofs are two-column proofs, paragraph proofs, and flowchart proofs. A two-column proof organizes statements and reasons into two columns. A paragraph proof describes the logical steps and reasons using sentences in a paragraph. A flowchart proof uses boxes and arrows to visually represent the progression of steps and logical flow.

2
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Sample Response: One type of proof is a two-column proof. It contains statements and reasons in columns. Another type is a paragraph proof, in which statements and reasons are written in words. A third type is a flowchart proof, which uses a diagram to show the steps of a proof. What did you include in your response? Check all that apply.Two-column proofs are in columns and list statements and reasons.Paragraph proofs use words.Flowchart proofs give a visual representation of the progression of

A
Two-column proofs are in columns and list statements and reasons.
B
Paragraph proofs use words.
C
Flowchart proofs give a visual representation of the progression of steps.
3

additionangle addition postulate definition of right anglesubstitution property

A
addition
B
angle addition postulate
C
definition of right angle
D
substitution property
4

angle ABC = 90 angle ABD = 90 2 times the measure of angle ABC = 90 2 times the measure of angle CBD = 90

A
angle ABC = 90
B
angle ABD = 90
C
2 times the measure of angle ABC = 90
D
2 times the measure of angle CBD = 90
110100

definition of congruent definition of bisect given reflexive property

A
definition of congruent
B
definition of bisect
C
given
D
reflexive property
110101

definition of congruent definition of bisect given reflexive property

A
definition of congruent
B
definition of bisect
C
given
D
reflexive property
110102

definition of congruent definition of bisect given reflexive property

A
definition of congruent
B
definition of bisect
C
given
D
reflexive property
110103

4590180360

A
45
B
90
C
180
D
360
110104

AEB AEC BEC BED

A
AEB
B
AEC
C
BEC
D
BED
110105

angle addition postulate reflexive property segment addition property symmetric property

A
angle addition postulate
B
reflexive property
C
segment addition property
D
symmetric property
110164

definition of right angledefinition of congruentdefinition of equaldefinition of 90 degrees

A
definition of right angle
B
definition of congruent
C
definition of equal
D
definition of 90 degrees
110165

identity propertyreflexive property substitution propertysymmetric property

A
identity property
B
reflexive property
C
substitution property
D
symmetric property
110166

definition of congruent angles definition of equal angles substitution property symmetric property

A
definition of congruent angles
B
definition of equal angles
C
substitution property
D
symmetric property
110167

Identify the missing parts in the proof.

Answers:
A::given
B::measure of angle ABC = 90
C::angle addition postulate
D::2 times the measure of angle CBD = 90
110168

✔ measure of angle ABC = 90measure of angle ABC = 180measure of angle ABD = 90 measure of angle CBD = 180

A
✔ measure of angle ABC = 90
B
measure of angle ABC = 180
C
measure of angle ABD = 90
D
measure of angle CBD = 180
110169

addition✔ angle addition postulate definition of right anglesubstitution property

A
addition
B
✔ angle addition postulate
C
definition of right angle
D
substitution property
110170

angle ABC = 90 angle ABD = 90 2 times the measure of angle ABC = 90 ✔ 2 times the measure of angle CBD = 90

A
angle ABC = 90
B
angle ABD = 90
C
2 times the measure of angle ABC = 90
D
✔ 2 times the measure of angle CBD = 90

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