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Math 8 Unit1A Vocabulary

Clockwise Turning in the same way that the hour or minute hand goes around a clock.
Counterclockwise Turning in the opposite way to the way that the hour or minute hand goes around a clock.
Reflection Takes every point of the figure to a point directly opposite to it on the other side of the line and the same distance from the line.
Rotation It has a center, an angle, and a direction. It moves every point of a figure in a circle around the center, in the direction specified, and and for a distance specified by the angle.
Translation Move every point in a figure a given distance in a given direction.
Transformation A translation, rotation, reflection, or dilation, or a combination of these.
Sequence of Transformations A set of translations, rotations, reflections, and dilations performed in a particular order on a geometric figure, resulting in a final figure.
Rigid Transformations A sequence of translations, rotations, and reflections that preserve the measurements of the shape.
Corresponding If a part of the first figure matches up with the same part of the image.
Vertical Angles A pair of angles that are across from each other at the point where two lines intersect. The angles are equal.
Alternate Interior Angles If 2 interior angles lie on opposite sides of the transversal.
Transversal A line that cuts across two parallel lines, intersecting each one.
Straight Angle If the two rays that make an angle form a straight line.
Image The moved object.
Congruent If there is a rigid transformation that moves the first figure so that it fits exactly over the second figure.
Created by: anielam