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### 32 Cards in this Set

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 zero angle m=0° right angle m=90° obtuse angle 90°0, then acbc. Equation to Inequality Property If a and b are positive numbers and a+b=c, then c>a and c>b. (the whole is greater than its parts) Substitution Property If a=b, then a may be substituted for b in any equation. proof argument for a conditional a sequence of justified conclusions, starting with the antecedent (numbered 0) and ending with the consequent. [one step - uses definition or theorem] slope the slope of the line through (x1,y1) and (x2,y2), with x1≠x2, is (y2-y1)/(x2-x1) [change in y values divided by corresponding change in x values]. Slope of horizontal line =0, slope of vertical line is undefined Parallel lines and Slopes Theorem Two nonvertical lines are parallel iff they have the same slope Transitivity of Parallelism Theorem In a plance if line l is parallel to line m and line m is parallel to line n, then line l is parallel to line n