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A location with no size or shape
Point
Made up of points with no thickness or width
Line
A measurable part of a line consisting of two endpoints
Line segment
A line that extends indefinitely in one direction
Ray
A flat surface made up of points and extends indefinitely in a direction
Plane
Points that lie on the same line
Non-Collinear:points that don’t lie on the same line
Collinear
Points that lie on the same plane
Non-Coplanar:points that don’t lie on the same plane
Coplanar
If two segments have the same length, then they are congruent
Congruent segments
If A,B and C are collinear points and B is between A and C then AB+BC=AC
Segment addition postulate
The formula used to find the distance between two points on a coordinate plane
Distance formula
The formula used to find the midpoint between two endpoints
Midpoint formula
A segment, line, plane that can intersect a segment at its midpoint
Segment bisector
A line segment with associated direction
Directed line segment
The “run” of a directed line segment
Horizontal component
The “rise” of a directed line segment
Vertical component
Two lines that intersect at a 90° angle (right angle)
Perpendicular
A line, segment, or ray perpendicular to a segment at its midpoint
Perpendicular bisector
Two lines that never intersect
Parallel lines
The intersection of two right at an endpoint
Angle
The common endpoint of an angle (where two rays/sides, intersect)
Vertex
An angle with a degree measure of 90°
Right angle
An angle with a degree measure less than 90°
Acute angle
An angle with a degree measure greater than 90°
Obtuse angle
An angle with a degree measure of 180°
Straight angle
Two angles that have the same measure are congruent
Congruent angles
Two angles that share a common side and vertex “next to” each other
Adjacent angles
<ABD and <DBC are adjacent, then <ABD+ <DBC=<ABC
Angle addition postulate
A line or ray that divides an angle into two equal parts
Angle bisector
Two angles directly across from each other on intersecting
Vertical angles
Two angles with measures that sum to 90°
DO NOT have to be adjacent
Complementary angles
Two angles with measures that sum to 180°
DO NOT have to be adjacent
Supplementary angle
Adjacent angles that are supplementary. Combine, they form a straight line
Linear pair
Note
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