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A point specifies only location; it has no length, width, or depth. We usually represent a point with a dot on paper, but the dot we make has some dimension, while a true point has dimension 0. 


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A line has only one dimension: length. It continues forever in two directions (so it has infinite length), but it has no width at all. A line connects two points via the shortest path, and then continues on in both directions 


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A line segment is the portion of a line lying strictly between two points. It has a finite length and no width. 


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A ray can be thought of as a half a line. It has a point on one end, and it extends infinitely in the other direction. 


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A plane is a flat, twodimensional object. We often represent a plane by a piece of paper, a blackboard, or the top of a desk. In fact, none of these is actually a plane, because a plane must continue infinitely in all directions and have no thickness at all. A plane can be defined by two intersecting lines or by three noncollinear points. 


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two rays with a common endpoint that form a line 


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the union of 2 rays that have the same endpoint; measured in degrees or radians (trig.); the five types of angles are zero, acute, right, obtuse, and straight 


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the point M of [image] where AM = AB



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a ray that is in the interior of an angle and forms two equal angles with the sides of that angle 


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two figures where one is the image of the other under a reflection or composite of reflections 


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a description of a point in a network where it is possible for two different segments to share the same endpoints 


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an angle whose measure is greater than 0 but less than 90 degrees 


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an angle whose measure is greater than 90 but less than 180 degrees 


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an angle whose measure is 90 degrees 


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an angle whose measure is 180 degrees, forming a line with its sides 


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Complementary angles
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2 angles whose measures, when added together, equal 90 degrees 


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Supplementary angles
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angles that add up to 180 degrees 


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2 angles that share a common vertex and whose sides form 2 lines 


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2 nonstraight and nonzero angles that have a common side in the interior of the angle formed by the noncommon sides 


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2 supplementary adjacent angles whose noncommon sides form a line 


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Perpendicular lines
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2 segments, rays, or lines that form a 90 degree angle 


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a union of 3 or more segments where each segment intersects 2 other segments, one at each endpoint; "many sided" 


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A shape or solid that has an indentation if there is atleast one line segment connecting interior points which passes outside the figure 


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a geometric fugure with no identions. also if every line segmentconnecting interior points is entirely contained with the figures interior 


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A line segment connecting connecting nonadjacent vertices of a polygon 


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the distance around the outside of a plane figure 

