Line Proofs

Fill in the blanks

What is the statement for step 2?

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

• Corresponding Angles

• Substitution

• Definition of Congruent Angles

• Vertical Angles are congruent.

What is the relationship of ∠13 and ∠3?

• Corresponding Angles

• Alternate Interior Angles

• Alternate Exterior Angles

• Consecutive Interior Angles

• Vertical Angles

Supply the second reason.

• Linear Pair Postulate

• Alternate Interior Angles Theorem

• Vertical Angles Theorem

• Corresponding Angles Postulate

Find L

• ∠L=51°

• ∠L=129°

• ∠L=180°

• ∠L=39°

Fill in the reason for number 3. 

• Reflexive property

• Symmetric Property

• Transitive property

• Substitution property

If angles A and B are a linear pair, what else do you know about them?

• They are supplementary

• They are complementary

• They are congruent

• They are vertical

Which proof is incorrect?

• 
• 
• 
• 

Which property justifies the next step?

• Definition of linear pair

• Definition of supplementary angles

• Congruent supplements thm

• Linear pair postulate