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Mathematics 13 Online
OpenStudy (anonymous):

which of the following is not used in two-column proof? A-Theorems B-Postulates C-Definitions D-All of the above are used

jimthompson5910 (jim_thompson5910):

You use all of them whenever possible. There is no rule that says you cannot use A, B or C. http://www.wyzant.com/resources/lessons/math/geometry/introduction/two_column_proofs

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