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two angles that share a side and vertex 


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if two angles form a linear pair, then they are supplementary. 


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angle that adds up to 90 degrees 


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angle thats measure is less than 90 degrees 


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angle thats measure is more than 90 degrees and less than 180 degrees 


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two lines that intersect to form a right angle 


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two coplanar lines that do not intersect 


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a bisector that is perpindicular to a segment 


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a line or ray that divides an angle into two 


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a circle that is inside a triangle and touches three sides 


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a circle outside the triangle ane contains all three vertices 


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a transformation that does not change its size or shape of a figure 


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every point of a figure moves around a given point known as the center 


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ever point in a geometric figure is flipped across the 


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deduction/deductive reasoning 

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the process of drawing logically certain 


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when you interchange the hypothesis and the conclusion of a conditional statement 


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three different conditionals are linked together 


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two angles in a plane that share a common vertex and a common side but have no interior points in common 


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a statement using if and only if 


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an example that proves that a statement, then a conjecture is false 


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the phrase following the word then in a conditional statement; the final statement of an argument 


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any relation that satisfies the reflexive 


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a statement that has been proven to be true deductively 


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