# Geometry Defined Terms

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Collinear
If three or more points all belong to the same line they are said to be collinear
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Concurrent
If three or more lines contain the same point, they are said to be concurrent
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Between
If B is between A and C, Then points A, B, C are distinct collinear points and AB + BC = AC
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Same Side
Points B and C are said to be on the same side of point A if A, B, C are collinear and point A is not between point B and C.
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Line Segment
A line segment is a set of two points and all the points between them.
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Ray
A Ray is a set of points consisting of a fixed point of a line and all the points of the line on the same side of the fixed point.
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Opposite Rays
Opposite Rays are two rays of the same line that have a common endpoint and no other point in common.
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Angle
An angle is a set of points consisting of the union of 2 rays with a common endpoint (vertex)
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Interior
A point P lies in the interior of an angle if there exist two points, one on each ray, neither at the vertex, such that the point P is between said two points.
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Congruent Line Segments
Congruent Line Segments are line segments that are equal in measure
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Congruent Angles
Congruent Angles are angles that are equal in measure
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Midpoint
The midpoint of a line segment is a point of the line segment such that 2 segments formed are congruent.
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Line Segment Bisector
A line segment bisector is a line that intersects the line segment at its midpoint.
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Right Angle
A right angle is an angle measuring 90 degrees.
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Acute Angle
An acute angle is an angle measuring less than 90 degrees but greater than 0 degrees
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Obtuse Angle
An obtuse angle is an angle measuring greater than 90 degrees but less than 180 degrees
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Complementary Angles
Complementary Angles are 2 angles the sum of whose measures is 90 degrees.
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Supplementary Angles
Supplementary Angles are 2 angles the sum of whose measuring 180 degrees
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intersect
Two lines are said to intersect of they have a point in common
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Perpendicular Lines
Perpendicular Lines are 2 lines that intersect and forms a right angle
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Angle Bisector
An angle bisector is a ray whose endpoint is the vertex of the angle and that forms 2 congruent angles
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Reversed Midpoint
A point of the line segment that forms 2 congruent segments is the midpoint of the line segment
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Reversed line segment bisector
A line that intersects the midpoint of a line segment is a line segment bisector
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Reversed right angle
A angle whose measure is 90 degrees is a right angle
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Reversed angle bisector
A ray whose endpoint is the vertex of the angle and that forms two congruent angles is an angle bisector.
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Reversed congruent angle