Points, Lines, Planes, and Intersections in 3D Space
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12 Terms
Point
An exact location in space that has no dimension. A point describes a location but has NO size.
Line
Infinitely many points that form a straight path and extend forever in both directions. It is one-dimensional. Uniquely determined by TWO points.
Plane
A flat, two-dimensional surface that extends infinitely in both dimensions. It is determined by three non-collinear points.
Coplanar Points
Points that lie on the same plane. Three points are always coplanar.
Line Segment
A part of a line that connects two endpoints. The line segment has a measure - length, which is a distance between endpoints.
Ray
A part of a line that has one endpoint and extends forever in one direction.
Opposite Rays
Two rays that have the same endpoint, extend in opposite directions, and form a straight line.
Skew Lines
Two lines that DO NOT intersect and are NOT parallel.
Intersecting Planes
Two planes that cross or intersect.
collinear points
points that lie on the same line
intersection point
the point at which two lines meet and cut across each other
intersection line
two planes intersect at a line