- a portion of a line which starts at a point and goes off in a particular direction
- ray
- a line that has two endpoints
- line segment
- a dot that indicates location
- point
- a flat surface two dimensional surface
- plane
- has no curves no thickness and extends in both direcrions
- line
- a angle that measures at exactly 90 degrees
- right angle
- a angle that measures 45 degrees
- Acute
- a angle that measures at 120 degrees
- obtuse
- a property of measurement related to the unit of measure use
- precision
- the length of how far two points are from each other
- distance
- the middle of the line segment
- midpoint
- two angles that when added together gives you 180 degrees
- supplementary angle
- two angles that when added together you 90 degrees
- complementary angle
- a pair of non adjacent angles formed when two lines intersect
- vertical
- two angles that have a common side and vertex
- adjacent
- a pair of adjacent supplementary angles
- linear pair
- the same or similar
- congruent
- being cut into two equal parts
- bisector
- points that lie on the same plane
- coplanar
- points that lie on the same line
- colinear
- boundless three dimensional that contains lines and planes
- space
- difference between actual measure and allowable measure
- absolute error
- the ratio of absolute error to the actual measure
- relative error
- a circle broke into 360 parts
- degree
- the rays or faces of an angle
- sides

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