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Geometry

Vocabulary

TermDefinition
Point An undefined term thought as a location with no size or dimension
Line An undefined straight, continuous arrangement of infintely many points extending forever in two directions. A line has length, but no width or thickness, so it is one-dimensional
Plane A flat surface that extends forever. It has infinite length and width but no thickness
Line Segment Two points and all the points between them that are collinear with the two points
Collinear Points that lie on the same line
Coplanar Points that lie on the same plane
Ray A point on a line,and all of the points of the line that lie on one side of the endpoint
End points The point at either end of a segment or the first point of a ray
Oppsoite Rays Collinear rays with the same endpoint
Intersection The set points that objects have in common
Congruent Objects that have the same measure
Bisect To divide into two congruent parts
Midpoint An object that intersects a segment into two congruent segments (bisector)
Angle An object formed by two rays with the same endpoint
Vertex The commom endpoint in an angle
Angle Bisector An object that divides an angle into two congruent angles
Straight Angle An angle with a measure of 180 degrees. (straight line)
Obtuse Angle An angle with a measure of 90 degrees and 180 degrees
Right Angle An angle with a measurement of 90 degrees
Acute Angle An angle with a measurement less than 90 degrees
Complementary Two angles whose sum is 90 degrees
Supplementary Two angles whose sum is 180 degrees
Adjacent Angles Angles that have a common side and a common vertex, but no common interior points
Vertical Angles Two angles whose sides form two pairs of opposite rays
Created by: Carlos_F
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