Wow!! Look at all the points, lines and

planes!

Pick the justification for each statement…

1. If y = 7, then 7 = y.

2. If x + 7 = 12, then x = 5.

3. If 5x = -20, then x = -4

4. If n = 5, then 3n – 9 = 3(5) – 9

A. Substitution B. Reflexive C. Addition D. Symmetric E. Distributive

F. Subtraction G. Division H. Transitive J. Reflexive K. Symmetric

A. Distributive B. Subtraction C. Division D. Substitution E. Reflexive

F. Multiplication G. Transitive H. Substitution J. Distributive K. Addition

Lesson 2-2

• I can write a geometry proof using congruence

AB = AB

∠1 ≅ ∠1

if AB = CD, then CD = AB

If ∠1 ≅ ∠2, then ∠2 ≅ ∠1

if AB = CD and CD = EF, then AB = EF

If ∠1 ≅ ∠2, and ∠2 ≅∠3 then ∠1 ≅ ∠3

1. Given

3. Transitive prop.2. Given

1. m∠1 = m∠2

2. m∠2 = m∠33. m∠1 = m∠3

half-way

1. Given

AB ≅ BC

BC ≅ CD

3. Midpoint Thm

4. Midpoint Thm

AB ≅ CD 5. Transitive Prop

2. Given

divides two congruent angles

congruent

1. Given

∠1 ≅ ∠2 4. Def’n of angle bisector∠3 ≅ ∠4 5. Def’n of angle bisector∠2 ≅ ∠3 6. Transitive prop

2. Given

3. Given

∠2 ≅ ∠4 7. Transitive prop

∠1 ≅ ∠2 ∠3 ≅ ∠4 ∠1 ≅ ∠4

1. Given

4. Substitution

2. Vertical Angle Thm3. Vertical Angle Thm

FLASH CARDS

• Cut your paper into 16 flashcards (fold in half 4 times!)

• Write property/definition name on one side

• Write what is says on the other

Symmetric Property

If a = b then b = a

FRONT BACK

Midpoint Theorem AX ≅XB

FRONT BACK

Def’n of Angle

Bisector ∠1≅ ∠2

FRONT BACK

12

FLASH CARDS

• Reflexive Property• Symmetric Property• Transitive Property• Addition Property• Subtraction Property• Multiplication

Property• Division Property

• Distributive Property• Substitution Property• Midpoint Theorem• Definition of Angle

Bisector

ASSIGNMENT:2-2 worksheet