This video introduces the concept of two column proofs in geometry. The first column is the statements column, where logical steps from the givens to the proof statement are listed, while the reasons column should only contain given theorems, postulates, and definitions. It's important to show all words in the statement column and use the actual wording of the theorem or definition in the reasons column to recognize if it has been used in the statements. Using theorem or postulate numbers is not recommended as they may change from book to book.
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Video introduces two column proofs