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Pearson Geometry Unit i

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Term
Definition
Collinear points   points that lie on the same line.  
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Coplanar   points and lines lie in the same plane.  
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Intersection   the set of points the figures have in common.  
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Line   a straight path that extends in two opposite directions without end and has no thickness; contains infinitely many points.  
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Opposite rays   two rays that share the same endpoint and form a line.  
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Plane   represented by a flat surface that extends without end and has no thickness; contains infinitely many lines.  
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Point   indicates a location and has no size.  
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Postulate   an accepted statement of fact.  
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Ray   part of a line that consists of one endpoint and all points of the line on one side of the endpoint.  
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Segment   part of a line that consists of two endpoints and all points between them.  
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Congruent segments   Two segments that have the same length.  
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Coordinate   the real number that corresponds to the location of a point.  
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Distance   the absolute value of the difference of two point's coordinates.  
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Midpoint   the point that divides a segment into two congruent segments.  
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Segment bisector   a point, a line, a ray, or another segment that intersects a segment at its midpoint.  
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Acute angle   an angle whose measure is between 0 and 90.  
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Angle   formed by two rays with the same endpoint.  
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Congruent angles   angles with the same measure.  
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Obtuse angle   an angle whose measure is between 90 and 180.  
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Right angle – A right angle is   an angle whose measure is 90.  
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Straight angle   an angle whose measure is 180.  
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Vertex of an angle   the common endpoint of the two rays that form the angle.  
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