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### 27 Cards in this Set

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 Opposing rays Rays that go in opposite directions Absolute value How far apart two numbers are from each other (always positive) Collineral points Points all in one line Coplanar points Points all in one plane Intersection of two figures Set of points that are in both figures Length Distance between the endpoints Ruler Postulate 1. The points on a line can be paired with the real numbers in a way that any 2 points can have coordinates 0 and 1 2. The distance between any two points equals the absolute value of the diference of their coordinates Segment Addition Postulate If B is between A and C, then AB + BC = AC Congruent objects Two objects that have the same size and shape Midpoint of a segment Point that divides the segment into two congruent segments Bisector of a segment Line, segment, ray, or plan that intersects the segment at its midpoint Angle Figure formed by two rays that have the same endpoint Angle Addition Postulate If point B lines in the interior of AOC, then mAOB + mBOC = mAOC Adjacent angles Two angles that have a common vertex and a common side but not common interior points Bisector of an angle Ray that divides the angle into two congruent adjacent angles Acute angle Measure between 0 and 90 Right angle Measure 90 Obtuse angle Measure between 90 and 180 Straight angle Measure 180 Postulate 5 A line contains at least two points; a plane contains at least three points not all in one line; space contains at least four points not all in one plane Postulate 6 Through any two points there is exactly one line Postulate 7 Through any three points there is at least one plane, and through any three noncollinear points there is exactly one plane Postulate 8 If two points are in a plane, then the line that contains the points is in that plane Postulate 9 If two planes intersect, then their intersection is a line Theorem 1-1 If two lines intersect, then they intersend in exactly one point Theorem 1-2 Through a line and a point notin the line there is exaclty one plane Theorem 1-3 If two lines intersect, then exactly one plane contains the line