- A location that has no size
- Point
- A straight 180 degree angle
- Line
- A flat surface
- Plane
- Part of a line that starts at an end point and extends forever in one direction
- Ray
- 90 degree angle
- Right angle
- An angle that measures greater than 0 degrees and less than 90 degrees
- Acute angle
- An angle that measures greater than 90 degrees but less than 180 degrees
- Obtuse angle
- Two angles whose measures have a sum of 90 degrees
- Complementary angles
- Two angles whose measures have a sum of 180 degrees
- Supplementary angles
- Having the same size and shape
- Congruent
- The point that divides a segment into two congruent segments
- Midpoint
- Points that lie on the same straight line
- Collinear points
- Lines that do not lie on the same surface or plane
- non coplanar
- An angle of 180 degrees
- Straight angle
- have the same angle
- Congruent angles
- are simply line segments that are equal in length
- Congruent segments
- is a pair of adjacent, supplementary angles
- Linear pair
- lines in a plane which do not meet
- Parallel planes
- are two lines that do not intersect and are not parallel.
- Skew lines
- each of the parts into which something is or may be divided
- Segment
- lines that lie on the same plane.
- Coplanar lines
- Points that do not all lie on a single line.
- Noncollinear points

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