Intro to Two Column Proofs

If M is the midpoint of AB, then AM = MB

• Addition POE

• Def. of Midpoint 

• Reflexive POE

• Symmetric

What is reason 5?

• Transitive Property

• Reflexive Property

• Symmetric Property

• Prove

What is the missing statement in the proof?

• m∠ABD+m∠DBC=m∠ABC

• m∠ABD=m∠DBC

• m∠ABC=m∠ABC

• none of the other choices are correct

• Corresponding

• Alt Ext Angle

• vertical

• Alt Int Angle

Supply the second reason.

• Linear Pair Postulate

• Alternate Interior Angles Theorem

• Vertical Angles Theorem

• Corresponding Angles Postulate

Fill in the reason for number 5. 

• Definition of congruent angles

• Angle Addition Postulate

• Substitution Property

• Transitive Property

Which is the correct reason for statements 2 and 4 in the proof?

• Corresponding Angles

• Substitution

• Definition of Congruent Angles

• Vertical Angles are congruent.

Which property justifies the next step?

• Definition of linear pair

• Definition of supplementary angles

• Congruent supplements thm

• Linear pair postulate

What is the reason?

• Transitive 

• Substitution

• Middle Man

• Replacing 

What is the REASON for Statement #2?

• Given

• Definition of Complementary Angles

• Substitution Property

• Reflexive Property of Congruence