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f Select the postulate or theorem that can be used to prove that lines P and Q are parallel. f

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f State the postulate or theorem you would use, to prove that ∠2 and ∠3 are congruent. f

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f State the postulate or theorem you would use, to prove that lines l and m are parallel. f

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f State the postulate or theorem you would use, to prove that lines m and n are parallel. f

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f ∠1 and ∠2 are supplementary. State the theorem or postulate to prove l  m. f

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f In the triangle ABC, DE¯  BC¯, ∠BAC = 40° and ∠ACB = 80°. Which theorem / postulate will help you to prove ∠ADE = 60°? f

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