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Point
A geometric element having definite position but no size, shape or extention
Line
Any straight one-dimensional geometrical element who’s identity is determined by 2 different points. (no endpoints)
Line Segment
Any finite segment of a line (2 endpoints)
Ray
Any straight line that extends from a point (1 endpoint)
Plane
A flat, 2D surface that extends indefinitely
Angle
The difference in direction between 2 lines or surfaces, measured in degrees. (Vertex is alway middle letter)
Collinear Points
2 or more points that share the same straight line
Coplanar Lines
Lines that share the same plane
Skew Lines
Two or more lines that lie on different planes, do not intersect and aren’t parallel
Parallel Lines
Lines that lie in the same plane but will never meet no matter how far extended
Perpendicular Lines
Lines that intersect at a 90 degree angle
Note 
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