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Unit 1 Vocabulary

Across
A figure created by two distinct rays that share a common endpoint (also known as a vertex). ∠ABC or ∠B or ∠CBA indicate the same angle with vertex B.
A transformation of a figure that creates a mirror image, “flips,” over a line
The set of all points equi distant from a point in a plane
A point, line or line segment that divides a segment or angle into two equal parts
A transformation that slides each point of a figure the same distance in the same direction
An infinite set of points with no thickness and its length continues in two opposite directions indefinitely
Two lines that intersect to form right angles
Angles that have the same relative position in geometric figures
A figure before a transformation has taken place
The point at which two or more lines intersect or cross
The result of a transformation
A line that acts as a mirror so that corresponding points are the same distance from the mirror.
Down
A part of a line between two points on the line
The location at which two lines, line segments or rays intersect
The amount of rotation (in degrees) of a figure about a fixed point such as the origin.
Sides that have the same relative position in geometric figures
Having the same size, shape and measure. ∠A ≅∠B indicates that angle A is congruent to angle B
The mapping, or movement, of all points of a figure in a plane according to a common operation, such as translation, reflection or rotation
Two lines are parallel if they lie in the same plane and do not intersect
One of the basic undefined terms of geometry that represents a location. A dot is used to symbolize it and it is thought of as having no length, width or thickness.
A transformation that turns a figure about a fixed point through a given angle and a given direction, such as 90° clockwise
The point at each end of a line segment or at the beginning of a ray
A part of a line that begins at a point and continues forever in one direction