Pearson Geometry Common Core, 2011
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Pearson Geometry Common Core, 2011 View details
5. Indirect Proof
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Exercise 4 Page 319

The first step of an indirect proof is to assume the opposite, or negation, of the given statement. Let's think about the given statement.
To write a negation of the given statement, we need to consider how to say its opposite. Typically this can be done using the word
Since the first step is to the opposite, we should include this fact in our sentence.