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
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Represented by a lettered dot (i.e. P, Q, etc.)
Point
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An infinite number of points on a straight path that extends in two directions with no end and no thickness
Line
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An infinite number of points and lines on a flat surface that extends forever without end and has no thickness
Plane
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Part of a line that consists of two endpoints and all of the points between them
Segment
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Part of a line that consists of one endpoint and all the points in one direction from the endpoint to infinity
Ray
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Rays with the same endpoint that lie on the same line
Opposite Rays
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Formed by two rays with the same endpoint. Each ray is a side of the angle. The endpoint is the vertex.
Angle
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Lines that intersect to form a right angle
Perpendicular Lines
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⟂ Symbol (i.e. AB ⟂ CD)
Perpendicularity symbol (_ is perpendicular to _)
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Lines that lie in the same plane and do not intersect
Parallel Lines
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∥ or // Symbol (i.e. AB ∥ CD)
Parallelism Symbol (_ is parallel to _)
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∠ Symbol (i.e. ∠ABC or ∠CBA)
Angle Symbol
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Lines that do not lie in the same plane and do not intersect
Skew Lines
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Points that lie on the same line
Collinear Points
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Points that lie on the same plane
Coplanar Points
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A statement that is assumed to be true
Postulate
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Every point on a line can be paired with a unique real number. The number is called the coordinate of the point
Ruler Postulate
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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
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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
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Equal in value/measure
Congruent
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≅ Symbol (i.e. AB ≅ CD)
Congruence Symbol (_ is congruent to _)
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Geometric figure made using only a compass and a straight edge
Construction
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A line, segment or ray that is perpendicular to another segment amd splits the segment into two congruent segments
Perpendicular Bisector
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A ray that divides an angle into two congruent angles
Angle Bisector
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The middle point of a segment
Midpoint
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