1.
When can you assume angles are vertical in a diagram? -> When they are opposite angles formed by intersecting lines or segments
True
False

2.
Which is a pair of vertical angles?

-> ∠AOB and ∠WOX
True
False

3.
In order use the segment addition postulate to conclude that XY + YZ = XZ , what must we know about points X , Y , and Z ? -> ∠XYZ and ∠YZX are complementary
True
False

4.
Which is always true of complementary angles ∠X and ∠Y ? -> m∠X + m∠Y = 90
True
False

5.
Using the figure below, prove that ∠CME and ∠DMF are congruent.

Statements Reasons 1. ∠CMD ≅ ∠AMB Given 2. ∠AMB and ∠FME are vertical angles Given 3. ∠AMB ≅ ∠FME ? 4. ∠CMD ≅ ∠FME ? 5. m∠CMD = m∠FME ? 6. m∠CMD + m∠DME = m∠FME + m∠DME ? 7. m∠CME = m∠DMF ? 8. ∠CME ≅ ∠DMF ?

Which of the following is the best reason for statement 3? -> Definition of angle bisector
True
False

6.
Using the figure below, prove that ∠CME and ∠DMF are congruent.

Statements Reasons 1. ∠CMD ≅ ∠AMB Given 2. ∠AMB and ∠FME are vertical angles Given 3. ∠AMB ≅ ∠FME ? 4. ∠CMD ≅ ∠FME ? 5. m∠CMD = m∠FME ? 6. m∠CMD + m∠DME = m∠FME + m∠DME ? 7. m∠CME = m∠DMF ? 8. ∠CME ≅ ∠DMF ?

Which of the following is the best reason for statement 4? -> Reflexive property of congruence
True
False

7.
Using the figure below, prove that ∠CME and ∠DMF are congruent.

Statements Reasons 1. ∠CMD ≅ ∠AMB Given 2. ∠AMB and ∠FME are vertical angles Given 3. ∠AMB ≅ ∠FME ? 4. ∠CMD ≅ ∠FME ? 5. m∠CMD = m∠FME ? 6. m∠CMD + m∠DME = m∠FME + m∠DME ? 7. m∠CME = m∠DMF ? 8. ∠CME ≅ ∠DMF ?

Which of the following is the best reason for statement 5? -> Addition property of equality
True
False

8.
Using the figure below, prove that ∠CME and ∠DMF are congruent.

Statements Reasons 1. ∠CMD ≅ ∠AMB Given 2. ∠AMB and ∠FME are vertical angles Given 3. ∠AMB ≅ ∠FME ? 4. ∠CMD ≅ ∠FME ? 5. m∠CMD = m∠FME ? 6. m∠CMD + m∠DME = m∠FME + m∠DME ? 7. m∠CME = m∠DMF ? 8. ∠CME ≅ ∠DMF ?

Which of the following is the best reason for statement 6? -> Division property of equality
True
False

9.
Using the figure below, prove that ∠CME and ∠DMF are congruent.

Statements Reasons 1. ∠CMD ≅ ∠AMB Given 2. ∠AMB and ∠FME are vertical angles Given 3. ∠AMB ≅ ∠FME ? 4. ∠CMD ≅ ∠FME ? 5. m∠CMD = m∠FME ? 6. m∠CMD + m∠DME = m∠FME + m∠DME ? 7. m∠CME = m∠DMF ? 8. ∠CME ≅ ∠DMF ?

Which of the following is the best reason for statement 7? -> Definition of congruence
True
False

10.
Using the figure below, prove that ∠CME and ∠DMF are congruent.

Statements Reasons 1. ∠CMD ≅ ∠AMB Given 2. ∠AMB and ∠FME are vertical angles Given 3. ∠AMB ≅ ∠FME ? 4. ∠CMD ≅ ∠FME ? 5. m∠CMD = m∠FME ? 6. m∠CMD + m∠DME = m∠FME + m∠DME ? 7. m∠CME = m∠DMF ? 8. ∠CME ≅ ∠DMF ?

Which of the following is the best reason for statement 8? -> Angle addition postulate
True
False