The common endpoint of an angle
Vertex
Points that are on the same line
Colinear
Two angles that lie in the same plane, have common vertex & a common side, but no common interior points
AdjacentAngles
The sum of the measures of the angles of a triangle is 180
AngleSumTheorem
Lines that are in the same plane & never meet
Parallel
A ray that divides an angle into two congruent angles
AngleBisector
Lines that are in different planes & never meet
Skew
Makes a straight line & measure of 180 degrees
OppositeRays
Two nonadjacent angles formed by two intersecting lines
VerticalAngles
The rays of an angle
Sides
Description of line that form right angles
Perpendicular
A geometric term that can be explained using undefined terms and/or other defined terms
Defined Terms
A set of points common to two or more geometric figures
Intersection
Two angles with measures that have a sum of 90
ComplementaryAngles
Lines that intersect
Non-Parallel
It is neither on the angle nor in the interior of the angle
Exterior
The boundless three dimensional set of all points
Space
An angle with the degree measure of 90
RightAngle
A point is in the interior of angle if it does not lie on the angle itself & it lies on a segment with endpoints that are on the sides of the angle
Interior
Two angles with measures that have a sum of 180
Supplementary
A flat surface made up of points that extend indefinitely in all directions
Plane
Points that lie on the same place
Coplanar
The intersection of two non-collinear rays at a common endpoint
Angles
A pair of adjacent angles where non-common sides are opposite rays
LinearLines
An angle with a degree measure less than 90 degrees
Acute