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Geometry Vocab 2
points, lines, and planes
12
Mathematics
9th Grade
09/12/2015

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Cards

Term
Has no size or dimension. It is simply a location in space.
Definition
A collection of points along a straight path that extends endlessly in both directions.

(one dimensional)
Term
A flat surface that extends endlessly in all directions.

(two dimensional)
Definition
Part of a line consisting of two end points and all points between them
Term
Part of a line consisting of one end point and goes on endlessly away from that point.
Definition
Points that lie on the same line
Term
Points that lie on the same plane
Definition
Lines that never intersect but lie on the same plane

(not skew)
Term
Lines that intersect at a 90 degree angle
Definition
Lines that never intersect because they are on different planes

(not parallel)
Term
Through any two points there is exactly one line
Definition
If two lines intersect, they intersect at exactly one point
Term
If two planes intersect they intersect at exactly one line.
Definition
Sign for similar
Term
Congruent symbol
Definition
Sign for equals
Term
if and only if
Definition
divide the segment or angle exactly halfway to create two congruent segments or angles.
Term
A ray that divides and angle into two congruent angles
Definition
The midpoint of a segment is the point that is the same distance from both endpoints.
Term
An angle that is exactly 90 degrees
Definition
An angle that measures between 90 degrees and 180 degrees (larger that a right angle)
Term
An angle that measures between 0 degrees and 90 degrees (smaller than a right angle)
Definition

Two angles are a linear pair if they share a vertex and have a common side, & their non-common sides form a line

 

[image]

 

O=vertex

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