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Point, Line, Plane and Angles
Point, Line, Plane and Angles
23
Mathematics
08/13/2011

Term
 Point
Definition
 names a location in space and has no size   or   formed when 2 lines intersect
Term
 Line
Definition
 a straight path that has no thickness and extends forever   or   formed when two planes intersect
Term
 Plane
Definition
 a flat surface that has no thickness and extends forever
Term
 Collinear
Definition
 points that lie on the same line
Term
 Coplanar
Definition
 points that lie on the same plane
Term
 Skew lines
Definition
 lines that are not coplanar
Term
 Line segment
Definition
 part of a line consisting of 2 endpoints and all points between them
Term
 Ray
Definition
 a part of a line that starts at an endpoint and extends forever in one direction
Term
 Angle
Definition
 a figure formed by 2 rays with a common endpoint
Term
 Vertex
Definition
 the common endpoint of the sides of an angle
Term
Definition
 2 angles in the same plane with a common vertex and a common side
Term
 Complementary angles
Definition
 2 angles whose measures have a sum of 90 degrees
Term
 Supplementary angles
Definition
 2 angles whose measures have a sum of 180 degrees
Term
 Linear pair
Definition
 a pair of adjacent angles that form a line (opposite rays)
Term
 Midpoint
Definition
 the point that divides a segment into 2 congruent segments
Term
 Angle bisector
Definition
 a ray that divides an angle into 2 congruent parts
Term
 Parallel lines
Definition
 2 lines in the same plane that do not intersect
Term
 Perpendicular lines
Definition
 2 lines intersecting to form 90 degree angles
Term
 straight angle
Definition
 an angle measuring 180 degrees
Term
 acute angle
Definition
 an angle measuring less than 90 degrees
Term
 right angle
Definition
 an angle measuring 90 degrees
Term
 obtuse angle
Definition
 an angle measuring more that 90 degrees, but less than 180 degrees
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