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1. two distinct points lie on exactly one line 2. one may extend a line segment indefinitely in each direction 3. given any two distinct points, one may construct a circle with one point as center and the segment joinging the 2nd poin as radius. 4. any 2 right angles are equal in measure to each other 5. if a straight line falling on 2 straight lines makes the interior angles on the same side less then 2 right angles, then the two stright line, if extended indefinitely, meet on that side on which the angles are less than the two right angles. 


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1. things that are equal to the same thing are also equal to each other. 2. if equals are added to equals, then the sums are equal 3. if equals are subtracted from equals, the remainders are equal. 4. things that coincide with eachother are equal to each other. 5. the whole is greater than the part. 


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the square root of (x2x1) squared + (y2y1)squared 


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statemnts that are proven using postulates, axioms, and previously proven statements. 


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follows the if in an if then statement 


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follows then in an if then statement 


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flip the hypthesis and the conclusion 


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flip the hypthesis and the conclusion, then negate them 


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negate the original statement 


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1/10,000,000 of the distance from the north pole to the equator 


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360 degrees equals how many radians 

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180 degrees is how many radians 

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90 degrees is how many raidans 

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