Geometry Vocabulary 10/06
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| Set | collection of objects grouped in some way
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| Point | may be represented as a dot; it has no dimensions; it has no size; it only shows position
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| Line | a line may be treated as a set of points either curved or straight; a straight line may be considered an infinite set of points extending indefnitely in 2 opposite directions; a line has no endpoints, no width, no length
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| Straight Line | a straight line may be considered an infinite set of points extending indefnitely in 2 opposite directions; a line has no endpoints, no width, no length; it may represented in 2 ways - Naming 2 points on it (use capital letters), or use a small letter
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| Plane | may be considered as a set of points forming a completely flat surface extending indefinitely in all directions; a plane has no thickness; it may be represneted by a capital letter. "Plane P
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| Number Line | a straight line each of whose points can be associated with a real number
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| DIstance between 2 Points | on the real number line is the absolute value of the difference of the coordinates os the two points
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| Collinear Set of Points | a set of points all of which lie on the same straight line
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| Betweeness of Points on a Line | If A, B, and C are collinear points, such that AB+BC=AC, then B is between A and C
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| Line Segment | a line segment or segment is a set of points on a line called endpoints, and the set of all points on the line bewteen the end points
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| Half Line | the set of all the points in a line on the same side of a dividing point, not including the dividing point
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| Ray | is the set of all point in a half line including the dividing point which is called the Endpoint of the Ray
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| Length of a Line Segment | is the distance between its endpoints
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| Congruent segments | are segments that have the same length
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| Midpoint of a Line Segment | is the point of that line segment that divides the segment into two congruent segments
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| Segment is Bisected at a Point | if the point is the midpoint of the line segment
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| Bisector of a line segment | divides the segment into 2 congruent segments
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| Angle | is a set of points which is the union of 2 rays having the same ednpoint
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| Straight Angle | if the two rays that form an agle are opposite rays, the angle is a straight angle
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| Right Angle | is an angle whose measure is 90 degrees
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| Straight angle | is an angle whose meaures is 180 degrees
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| Acute angle | is an angle whose measure is between 0 and 90 degrees
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| Obtuse angle | an angle whose measure is bewteen 90 and 180 degrees
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| Reflex Angle | is an angle whose measure is between 180 and 360 degrees
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| Congruent angles | are angles which have the same measure
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| Angle bisector | divides an angle into two congruent angles
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| Adjacent angles | are two angles in the same plane which have a common vertex, a common side, but do not have any interior points in common
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| Vertical angles | are two angles which have a common vertex and whose sides are two pairs of opposite rays
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| Complementary angles | are two angles the sum of whose measures is 90 degrees
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| Supplementary angles | are two angles the sum of whose measures is 180 degrees
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| Linear Pair | 2 abgles with a common side and whose non-common sides are a pair of opposte rays
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| Perpiindicular Lines | 2 lines which intersect and form right angles
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| Perpindicular Bisector of a line segment | a line, line segment or a ray which is perpendicular to the line segment and bisects the line segment
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| Polygon | a closed figure us a plane which is the union of line segments
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| Triangle | a polygon that has 3 sides
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| Scalene Triangle | triangle with no congruent sides
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| Isosceles Triangle | a triangle with 2 congruent sides
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| Equilateral Triangle | a triangle with 3 congruent sides
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| Acute Triangle | a triangle with 3 acute angles
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| Equiangular Triangle | a triangle with 3 congruent angles
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| Right triangle | a triangle that has a right angle
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| Obtuse triangle | a triangle that has a obtuse angle
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| Altitude of a Triangle | a line segment drawn from any vertex of the triangle, perpendicular to and ending in the opposite side
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| Median of a Triangle | bisects the side to which it is drawn
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| Angle Bisector | divides an angle into 2 congruent angles
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