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The mapping, or a movement, of all points of a figure in a plane according to a common operation, such as translation, reflection or rotation.
Transformation
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A line that acts as a mirror so that corresponding points are the same distance from the mirror.
Reflection Line
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A part of a line between two points on the line.
Line Segment
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The set of all points equidistant from a point in a plane.
Circle
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Sides that have the same relative position in geometric figures.
Corresponding Sides
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Having the same size, shape and measure.
Congruent
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A transformation of a figure that creates a mirror image, "flips", over a line.
Reflection
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One of the undefined terms of geometry that represents an infinite set of points with no thickness and its length continues in two opposite directions indefinitely.
Line
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The amount of rotation (in degrees) of a figure about a fixed point such as the origin.
Angle of Rotation
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A transformation that slides each point of a figure the same distance in the same direction.
Translation
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The point at which two or more lines interest or cross.
Intersection
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Angles that have the same relative position in geometric figures.
Corresponding Angles
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The point at each end of a line segment or at the beginning of a ray.
End Point
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A point, line or line segment that divides a segment or angle into two equal parts.
Bisector
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A figure created by two distinct rays that share a common endpoint.
Angle
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A figure before a transformation has taken place.
Preimage
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One of the basic undefined terms of geometry that represents a location.
Point
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A distance preserving map of a geometric figure to another location using a reflection, rotation or translation.
Isometry
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The location at which two lines, line segment or rays intersect.
Vertex
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A part of a line that begins at a point and continues forever in one direction.
Ray
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The result of a transformation.
Image
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A transformation that turns a figure about a fixed point through a given angle and a given direction.
Rotation
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