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Geometry
Chapter 1 Terms
24
Mathematics
10th Grade
11/12/2010

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Term
Equidistant
Definition
When two points are the same distance from a third point.
Term
Congruent
Definition
Lines, angles, and shapes that are the same size.
Term
Equal
Definition
Numbers that have the same value.
Term
Parallel
Definition
Lines or planes that never touch and head in the same direction. (coplanar)
Term
Skew
Definition
Lines that never touch and are in different planes.
Term
Plane
Definition
A flat surface that extends in all directions forever.
Term
Point
Definition
Smallest unit in geometry and represents an exact location.
Term
Line
Definition
Collection of collinear points that extends in opposite directions.
Term
Ray
Definition
Collection of lines that are collinear and extends in only one direction.
Term
Segment
Definition
Collection of points that are collinear that doesn't extend after the points.
Term
Intersecting
Definition
Lines that cross at a point and planes that cross at a line.
Term
Coplanar
Definition
Points and lines that are on the same plane. (points to be coplanar must be three different points)
Term
Collinear
Definition
Points that are on the same line. (There has to be at least two points)
Term
Theorem
Definition
A proven rule.
Term
Postulate
Definition
A rule assumed to be true. (not proven formally)
Term
Midpoint
Definition
the point exactly in the middle of two other points.
Term
Vertex
Definition
The place where two rays meet.
Term
Angle
Definition
Two rays that share the same endpoint.
Term
Acute Angle
Definition
An angle with a measure less than 90 and greater than 0.
Term
Obtuse Angle
Definition
An angle that measures more than 90 but less than 180.
Term
Straight Angle
Definition
An angle that measures exactly 180.
Term
Right Angle
Definition
An angle that measures exactly 90.
Term
Zero Angle
Definition
An angle that measures exactly 0.
Term
Bisector
Definition
A line that cuts an object exactly in half or makes co0ngruent angles.
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