Practice Proofs.notebook

1

September 16, 2013

"Do Now"

If x = 2, then 2 = x.

If x + 3 = y, then x = y – 3.

If m∠A = 10 and m∠B = 10, then m∠A = m∠B.

If , then

If a = c, then a + b = c + b.

Name the property/reason being used.

Check out Ms. Stalvey'sgrandparents' dock at Pawleys Island

Practice Proofs.notebook

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September 16, 2013

Review Last Night's Homeworkpg. 147 (#4)

Statements Reasons

C is the midpoint of AE.C is the midpoint of BD.AE BD.

a. a. Given

b. AC = CEBC = CD

b. Def of midpoint

c. AE = BD c. Def of segments

d. AE = AC + CEBD = BC + CD

d. Segment Addition Postulate

e. AC + CE = BC + CD e. Substitution

f. AC + AC = CD + CD f. Substitution

g. 2AC = 2CD g. Simplify

h. AC = CD h. Division Property of Equality

i. AC CD i. Def segments

Practice Proofs.notebook

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September 16, 2013

Statements Reasons

a. 1 and 3 are complementary. 2 and 3 are complementary.

b. m 1 + m 3 = 90m 2 + m 3 = 90

a. Given

d. m 3 = m 3

e. m 1 = m 2

f. 1 2

b. Def of complementary anglesc. m 1 + m 3 = m 2 + m 3 c. Substitution

d. Reflexive Property of Equality

e. Subtraction Property of Equality

f. Def congruent angles

Practice Proofs.notebook

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September 16, 2013

Proofs PracticeCarousel

With your group, write a two-column proof and a paragraph proof for your assigned problem.

You must all be productive, cooperative, and diligent.I expect you to be on-task for this entire assignment.

You must check off your two-column proof with Ms. Stalvey before you write your paragraph proof.

You must all be prepared to explain your proof with the class.

Practice Proofs.notebook

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September 16, 2013

Review Last Night's Homeworkpg. 141 (#24)

Practice Proofs.notebook

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September 16, 2013

Review Last Night's Homeworkpg. 141 (#26)

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September 16, 2013

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September 16, 2013

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September 16, 2013

Quizzie Poo

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September 16, 2013

Homework:1. Finish Proofs Practice Sheet

2. Keep working on Proofs Project -envelope due Wednesday!

Note: You may use the textbook only for ideas(DO NOT COPY/USE AN EXAMPLE THAT IS ALREADY

WORKED OUT)THIS WILL BE CONSIDERED PLAGIARISM

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