- A portion of a line which starts at a point and goes off in a particular direction.
- ray
- What is an exact position or location on a plane surface? (0 dimensions)
- point
- One part of a line that connects two points.
- segment
- A geometric figure formed by two lines that begin at a common point or by two planes that being at a common line.
- angle
- Length of a line segment.
- distance
- The point or set of points where one line or surface crosses another.
- intersection
- Two rays that have the same endpoint and extend in opposite directions.
- opposite rays
- It is straight and extends in two directions without end.
- line
- When points lie on a straight line.
- collinear
- When the points are positioned in a way that does not form a line.
- noncollinear
- When points lie in the same plane.
- coplanar
- A surface in which if any two points are chosen a straight line joins them on that surface.
- plane
- Lines/planes side by side that have the same distance between them.
- parallel
- Two angles that have a common vertex and a common side.
- adjacent angles
- Angles that do not share a vertex or side.
- nonadjacent angles
- Angles that add up to have the sum of ninety degrees.
- complementary
- Two angles that lie on the same side of a transversal and between the lines cut by the transversal.
- same-side interior
- When two lines are crossed by another line on opposite sides of the transversal between the lines.
- alternate interior
- A point on a line segment that divides it into two equal parts.
- midpoint
- Lines that are right angles to each other.
- perpendicular
- Angles opposite to each other when two lines cross.
- vertical angles
- A pair of adjacent,supplementary angles.
- linear pairs
- Angles that sum up to 180 degrees.
- supplementary
- A point,segment,line,or plane that divides a line segment into two equal parts.
- segment bisector
- A line or ray that divides an angle into two congruent angles.
- angle bisector

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