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Geometry Chapter 1 VOCAB

Terms in this set (34)

Point
A location with no size or shape
Line
made up of points with no thickness or width
Line segment
A measurable part of a line consisting of two endpoints
Ray
A line that extends indefinitely in one direction
Plane
A flat surface made up of points and extends indefinitely in all directions
Collinear
points that lie on the same line
Non-collinear
points that don't lie on the same line
*points G, H, and A are...
Coplanar
points that lie on the same plane
non-coplanar
-Points that do not lie on the same plane
(Must be at least four points)
*points G, D, F, H are...
Congruent Segments
If two segments have the same length, then they are congruent
Segment Addition Postulate
If A, B, and C are collinear points and B is between A and C, then AB+BC=AC
Distance Formula
The formula used to find the distance between two points on a coordinate plane
midpoint formula
The formula used to find the midpoint between two endpoints
segment bisector
a segment, line, or plane that intersects a segment at its midpoint
directed line segment
A line segment with an associated direction
horizontal component
The "run" of a directed line segment
vertical component
The "rise" of a directed line Segment
perpendicular
Two lines that intersect at a 90º angle (right angle) symbol:⊥
Perpendicular Bisector
A line, segment, or ray perpendicular to a segment at its midpoint
parallel lines
two lines that never intersect
symbol:||
angle
the intersection of two rays at an endpoint
symbol: ∠
vertex
the common endpoint of an angle (where the two rays/sides intersect)
right angle
an angle with a degree measure of 90º
acute angle
an angle with a degree measure less than 90º
obtuse angle
An angle with a measure greater than 90º but less than 180º.
straight angle
an angle with a degree measure of 180º
congruent angles
two angles that have the same measure
adjacent angles
Two angles that share a common side and vertex ("next to" each other")
Angle Addition Postulate
if ∠ABD and ∠DBC are adjacent, then ∠ABD+∠DBC=∠ABC
angle bisector
A line or ray that divides an angle into two equal parts
vertical angles
two angles directly across from each other on intersecting lines (always congruent)
complementary angles
Two angles with measures that sum to 90º
*do not have to be adjacent
supplementary angles
two angles with measures that have a sum of 180º
*do not have to be adjacent
linear pair
Adjacent angles that are supplementary. Combined, they form a straight line.
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