Practice Two Column Proofs

Complete the following proof of the Alternate Interior Angles Theorem.

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CCSS.8.G.A.5

Fill in the reason for number 5. 

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CCSS.7.G.B.5

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

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CCSS.7.G.B.5

Which proof is incorrect?

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CCSS.8.G.A.5

Which property justifies the next step?

• Definition of linear pair
• Definition of supplementary angles
• Congruent supplements thm
• Linear pair postulate

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CCSS.7.G.B.5

What is the reason?

• Transitive 
• Substitution
• Middle Man
• Replacing 

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CCSS.HSG.CO.C.10

Complete the reasoning for the two column proof.

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CCSS.7.G.B.5

1) Which statement restates the Given from the question?

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CCSS.8.G.A.5

2) Which statement represents what you have to prove from the question?

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CCSS.8.G.A.5

What is the reason for statement 2?

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CCSS.8.G.A.5