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Unformatted text preview: 4-9 Writing Up Proofs
A) Proofs a. We will always do two column b. Statements on the left and reasons on the right B) Proofs tips a. The Given is a step/statement (a lot times the first step) and the last statement is what is to be proven b. Derive your statements from the: i. Given ii. Definitions iii. Postulates iv. Previous proven theorems c. Derive your reasons from the: i. Figure ii. Given iii. Previous steps (transitive property!!) d. Example 1 Given: Prove:
ABC and as in the figure below, with DAB DBA and CAD CBD ABD , Statements Reasons Example 2 Given: The collinear points A, B, C, D, as in the figure below, with AD = CB Prove: AC = DB Statements Reasons ...
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- Spring '09