Basic Definitions
This is represented by a straight path that extends in two opposite directions without end and has no thickness.
line
This is a point that divides the segment into two congruent segments.
midpoint
This angle measures less than 90 degrees.
acute angle
These are two coplanar angles with a common side, a common vertex, and no common interior points.
adjacent angles
These are two lines that intersect to form right angles.
perpendicular lines
This is represented by a flat surface that extends without end and has no thickness.
plane
This is a point, line, ray, or other segment that intersects a segment at its midpoint.
segment bisector
This angle measures to 90 degrees.
right angle
These are two angles whose sides are opposite rays.
vertical angles
This is a line, segment, or ray that is perpendicular to the segmnet at its midpoint.
perpendicular bisector
This is part of aline that consists of two endpoints and all points between them.
segment
This is formed by two rays with the same endpoint.
angle
This angle measures more than 90 degrees but less than 180 degrees.
obtuse angle
These are two angles whose measures have a sum of 90 degrees.
complementary angles
The ratio of the vertical change to the horizontal change between any two points.
slope
This is part of a line that consists of one endpiot and all the points of the line on one side of the endpoint.
ray
This is the endpoint of the angle.
vertex
This angle measures 180 degrees.
straight angle
These are two angles whose sum is 180 degrees.
supplementary angles
This is a point where two lines meet
It does not have any length, width, shape or size, it only has a position.
point
This is a ray that divides an angle into two congruent angles.
angle bisector
Angles with the same measure are...
congruent
These are a pair of adjacent angles whose noncommon sides are opposite rays.
linear pair
These are two rays that share the same endpoint and form a line.
opposite rays