Geometry 1

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32 Terms

1
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A location with no size or shape
Point
Point
2
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Made up of points with no thickness or width
Line
Line
3
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A measurable part of a line consisting of two endpoints
Line segment
Line segment
4
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\
**A line** that extends indefinitely in one direction
Ray
Ray
5
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A **flat surface** made up of points and extends indefinitely in a direction
Plane
Plane
6
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Points that lie on the same line

* Non-Collinear:points that don’t lie on the same line
Collinear
Collinear
7
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Points that lie on the same plane

* Non-Coplanar:points that don’t lie on the same plane
Coplanar
Coplanar
8
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If two segments have the same length, then they are congruent
Congruent segments
Congruent segments
9
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If A,B and C are collinear points and B is between A and C then AB+BC=AC
Segment addition postulate
Segment addition postulate
10
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The formula used to find the distance between two points on a coordinate plane
Distance formula
Distance formula
11
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The formula used to find the midpoint between two endpoints
Midpoint formula
Midpoint formula
12
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A segment, line, plane that can intersect a segment at its midpoint
Segment bisector
Segment bisector
13
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A line segment with associated direction
Directed line segment
Directed line segment
14
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The “run” of a directed line segment
Horizontal component
Horizontal component
15
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The “rise” of a directed line segment
Vertical component
Vertical component
16
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Two lines that intersect at a 90° angle (right angle)
Perpendicular
Perpendicular
17
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A line, segment, or ray perpendicular to a segment at its midpoint
Perpendicular bisector
Perpendicular bisector
18
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Two lines that never intersect
Parallel lines
Parallel lines
19
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The intersection of two right at an endpoint
Angle
Angle
20
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The common endpoint of an angle (where two rays/sides, intersect)
Vertex
Vertex
21
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An angle with a degree measure of 90°
Right angle
Right angle
22
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An angle with a degree measure less than 90°
Acute angle
Acute angle
23
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An angle with a degree measure greater than 90°
Obtuse angle
Obtuse angle
24
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An angle with a degree measure of 180°
Straight angle
Straight angle
25
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Two angles that have the same measure are congruent
Congruent angles
Congruent angles
26
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Two angles that share a common side and vertex “next to” each other
Adjacent angles
Adjacent angles
27
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Angle addition postulate
Angle addition postulate
28
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A line or ray that divides an angle into two equal parts
Angle bisector
Angle bisector
29
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Two angles directly across from each other on intersecting
Vertical angles
Vertical angles
30
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Two angles with measures that sum to 90°

* **DO NOT** have to be adjacent
Complementary angles
Complementary angles
31
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Two angles with measures that sum to 180°

* **DO NOT** have to be adjacent
Supplementary angle
Supplementary angle
32
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Adjacent angles that are supplementary. Combine, they form a straight line
Linear pair
Linear pair