Geometry Vocab
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1
Two angles that add up to exactly 90°
Complementary Angles
2
Two angles that add to exactly 180°
Supplementary Angles
3
A location that has no sides
Point
4
Represented by a lettered dot (i.e. P, Q, etc.)
Point
5
An infinite number of points on a straight path that extends in two directions with no end and no thickness
Line
6
An infinite number of points and lines on a flat surface that extends forever without end and has no thickness
Plane
7
Part of a line that consists of two endpoints and all of the points between them
Segment
8
Part of a line that consists of one endpoint and all the points in one direction from the endpoint to infinity
Ray
9
Rays with the same endpoint that lie on the same line
Opposite Rays
10
Formed by two rays with the same endpoint. Each ray is a side of the angle. The endpoint is the vertex.
Angle
11
Lines that intersect to form a right angle
Perpendicular Lines
12
⟂ Symbol (i.e. AB ⟂ CD)
Perpendicularity symbol (_ is perpendicular to _)
13
Lines that lie in the same plane and do not intersect
Parallel Lines
14
∥ or // Symbol (i.e. AB ∥ CD)
Parallelism Symbol (_ is parallel to _)
15
∠ Symbol (i.e. ∠ABC or ∠CBA)
Angle Symbol
16
Lines that do not lie in the same plane and do not intersect
Skew Lines
17
Points that lie on the same line
Collinear Points
18
Points that lie on the same plane
Coplanar Points
19
A statement that is assumed to be true
Postulate
20
Every point on a line can be paired with a unique real number. The number is called the coordinate of the point
Ruler Postulate
21
If points A, B and C are on the same line, with B being between A and C, then AB + BC = AC
Segment Addition Postulate
22
The measure of an angle is the absolute value of the difference of the real numbers paired with the sides of the angle
Protractor Postulate
23
Equal in value/measure
Congruent
24
≅ Symbol (i.e. AB ≅ CD)
Congruence Symbol (_ is congruent to _)
25
Geometric figure made using only a compass and a straight edge
Construction
26
A line, segment or ray that is perpendicular to another segment amd splits the segment into two congruent segments
Perpendicular Bisector
27
A ray that divides an angle into two congruent angles
Angle Bisector
28
The middle point of a segment
Midpoint
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