Big Ideas Math Integrated I, 2016
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Big Ideas Math Integrated I, 2016 View details
4. Proving Statements about Segments and Angles
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Exercise 3 Page 473

A two-column proof has a statement and a reason.

statement, reason

Practice makes perfect
When we write a proof, we have to make statements that are supported by reasons. Since the order of events is to first make a statement and then to support it with reasons, the statement is on the left and the reason is on the right.

In a two-column proof, each statement is on the left and each reason is on the right.