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Geometry
Vocab Words for Points, Planes, and Angles
20
Mathematics
10th Grade
09/09/2012

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Term
Plane
Definition
(undefined)
1) extends without ending
2) has no thickness
3) has no edges
4) represented by a parallelogram
5) named by the points on the edges or a capital letter
Term
Line
Definition
(undefined)
1) made up of infinite points
2) extends in 2 directions without ending
3) has no thickness
4) a picture of a line has no thickness
5) represented by a line with arrows on each end
6) named by a lower case letter or any 2 points on the line
Term
Point
Definition
(undefined)
1) simplest figure in geometry
2) doesn't have size
3) represented by a dot with size
4) named by a capital letter
5) used for location
6) all geometric figures consist of points
Term
Postulate
Definition
A statement that is accepted without proof
Term
Space
Definition
Set of all points
Term
Intersection
Definition
The set of points were the two figures meet. the "shared" points
Term
Congruent Figures
Definition
Two geometric figures that have the same size and shape
Term
Opposite rays
Definition
Two rays that share a common endpoint and form a straight line
Term
Bisector of a segment
Definition
a line, segment, ray, or plane that intersects the segment at its midpoint
Term
Segment
Definition
part of a line that contains 2 pints (called endpoints) and all the points in between
Term
Ray
Definition
part of a line that contains a point (called the endpoint) and all the points to one side only
Term
Between
Definition
point B is between points A and C means B lies on AC
Term
Noncollinear points
Definition
points that do not lie on the same line
Term
Noncoplanar points
Definition
points that do not lie on the same plane
Term
Collinear points
Definition
points that lie on the same line
Term
Coplanar points
Definition
points that lie on the same plane
Term
Congruent Segments
Definition
segments that have equal lengths
Term
Coordinate of a point
Definition
the cumber paired with a point on the number line
Term
The length of a segment
Definition
the distance between the two endpoints of a segment. It is found by taking the absolute value of the coordinates of the endpoints of a segment
Term
Midpoint of a segment
Definition
the point that divides the segment into 2 congruent segments
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