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### 9 Cards in this Set

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 Can be proved similar if their verticies can be paired so that corresponding angles are congruent and coressponding sides are proportional similar polygons For similar polygon the ratio of the length of the two corresponding sides. scale factor The ratio of x to y is x/y and is sometimes written x:y ratio An equation stating that two ratios are equal. 1st and last terms are the extremes, middle terms are mean. proportion A circle diagram that may be used to represent a conditional. Venn Diagram Statements that are either both true or false Logically equivalent statement If not p, then not q Inverse a proof in which you assume temporarily that the conclusion is not true and then deduce a contradiction. Indirect proof If not q, then not p. Contrapositive