A portion of a line which starts at a point and goes off in a particular direction.
What is an exact position or location on a plane surface? (0 dimensions)
One part of a line that connects two points.
A geometric figure formed by two lines that begin at a common point or by two planes that being at a common line.
Length of a line segment.
The point or set of points where one line or surface crosses another.
Two rays that have the same endpoint and extend in opposite directions.
opposite rays
It is straight and extends in two directions without end.
When points lie on a straight line.
When the points are positioned in a way that does not form a line.
When points lie in the same plane.
A surface in which if any two points are chosen a straight line joins them on that surface.
Lines/planes side by side that have the same distance between them.
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.
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.
Lines that are right angles to each other.
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.
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