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Geometry Defenitions
Defenitions in Geometry
57
Mathematics
Not Applicable
10/06/2005

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Term
Collinear Points
Definition
Points that lie on the same line
Term
Noncollinear points
Definition
Points that do not lie on the same line
Term
Concurrent lines
Definition
Lines that intersect at a single point
Term
Coplanar points
Definition
Points that lie in/on the same plane
Term
Noncoplanar points
Definition
Points that do not lie in/on the same plane
Term
Coplanar lines
Definition
Lines that lay in the same plane
Term
Parellel lines
Definition
Coplanar lines that do not intersect
Term
Skew lines
Definition
Lines that are not coplanar
Term
Parellel planes
Definition
Planes in space that do not intersect
Term
Theorem
Definition
A statement which can be proved by a logical progression of defenitions, postulates, and previously proven theorems.
Term
Half line
Definition
The set of all points on a line on a given point of the line
Term
Ray
Definition
The union of a half line and its origin
Term
Half-plane
Definition
A subset of a plane consisting of all points on a given side of a line in the plane. If points A and B are in the same plane, then so is the segment joining them.
Term
Edge of a half-plane
Definition
The line that seperates the plane in two half planes. The line is not part of either half-plane.
Term
Opposite half-planes
Definition
The two half planes that are seperated by a particular line of the plane. If points A and B are in opposite half-planes then the segment joining them must intersect the edge of the half plane.
Term
Angle
Definition
The union of two distinct rays that form the angle
Term
Sides of an angle
Definition
The two rays that form an angle
Term
Vertex of an angle
Definition
The common endpoint (origin) of the two rays
Term
Interior of an angle
Definition
The intersection of two half planes each determined by a side of the angle and containing the other side (except for the vertex)
Term
Exterior of an angle
Definition
The complement of the union of the angle and its interior
Term
Triangle
Definition
The unioon of segments that connect three noncollinear points.
Term
Closed curve
Definition
A curve that begins and ends at the same point
Term
Simple curve
Definition
A curve that does not intersect itself (unless the starting and ending points coincide)
Term
Simple closed curve
Definition
A simple curve that is also a closed curve
Term
Circle
Definition
Set of all points that are a given distance from a given point in a given plane
Term
Center
Definition
The given point in the plane
Term
Radius of a circle
Definition
A segment that connects a point on the circle with the center
Term
Chord of a circle
Definition
A segment having both endpoints on the circle
Term
Diameter
Definition
A chord that passes through the center of a circle
Term
Arc
Definition
A curve that is a subset of a circle
Term
Interior of a circle
Definition
Set of all planar points whose distance from the center is greater than the length of the radius
Term
Exterior of a circle
Definition
Set of all planar points whose distance from the center is greater than the length of the radius
Term
Region
Definition
Union of a simple closed curve and its interior. The curve is the boundary of any region.
Term
Convex set
Definition
A set in which any of its two points determine a segment contained in a set (shape)
Term
Concave set
Definition
A set that is not convex
Term
Polygon
Definition
A simple closed curve that consists of only segments
Term
Side of a polygon
Definition
One of the segments that defines a polygon
Term
Vertex of a polygon
Definition
An endpoint on the side of the polygon
Term
Angle of a polygon
Definition
An angle with two properties : its vertex is a vertex of the polygon and each side of the angle contains a side of the polygon
Term
Equilateral polygon
Definition
A polygon in which all sides have equal lengths
Term
Equiangular polygon
Definition
A polygon in which all angles have the same measurements
Term
Regular polygon
Definition
A polygon that is both equilateral nd equiangular
Term
Diagonal
Definition
Any segment in a polygon that connects two vertices but is not a side of the polygon
Term
Interior of a convex polygon
Definition
The intersection of the interiors of its angles
Term
Exterior of a convex polygon
Definition
The union of exteriors of angles
Term
Surface
Definition
A connected set of points in space having only thickness
Term
Sphere
Definition
A surface in space consisting of the set of all points at a given distance from a given point
Term
Center of a sphere
Definition
Given point
Term
Radius (of a sphere)
Definition
A segment that connects a point of a sphere with the center
Term
Closed surface
Definition
A surface with a finite size that divides other points in space into an interior and an exterior
Term
Solid
Definition
Union of a closed surface and its interior
Term
Cone
Definition
The union of a region and all segments that connect the boundary of the region with a specific noncoplanar point
Term
Cylinder
Definition
The union of two regions of the same size and shape and place in different parallel planes, and the set of all segments that join corresponding points on the boundaries of the regions
Term
Polyhedron
Definition
A closed surface made up of polygonal regions
Term
Face of a polyhedron
Definition
One of the polygonal regions that form the surface of the polyhedron
Term
Regular polyhedron
Definition
Convex polyhedron having two properties : All faces are identical (same size and shape) and the same number of edges meet at each vertex
Term
Equivalence relation
Definition
A relation that is reflexive, symmetric, and transitive
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