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SHMS 8th Grade Math Vocab 1

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Term
Definition
Alternate Exterior Angles   Congruent pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on opposite sides of the transversal and are outside the other two lines.  
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Alternate Interior Angles   Congruent pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on opposite sides of the transversal and are in between the other two lines.  
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Angle of Rotation   The degree of rotation about a fixed point.  
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Congruent Figures   Figures that have the same size and shape.  
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Corresponding Sides   Sides that have the same relative positions in geometric figures.  
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Corresponding Angles   Congruent angles that have the same relative positions in geometric figures.  
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Dilation   Transformation that changes the size of a figure, but not the shape.  
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Linear Pair   Adjacent, supplementary angles. Excluding their common side, they form a straight line.  
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Reflection   A transformation that "flips" a figure.  
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Rotation   A transformation that turns a figure about a fixed point through a given angle and a given direction.  
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Same-Side Interior Angles   Supplementary pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on the same side of the transversal and are between the other two lines.  
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Same-Side Exterior Angles   Supplementary pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on the same side of the transversal and are outside the other two lines.  
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Scale Factor   The ratio of any two corresponding lengths of the sides of two similar figures.  
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Similar Figures   Figures that have the same shape but not necessarily the same size.  
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Transformation   The mapping, or movement, of all the points of a figure in a plane according to a common operation.  
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Translation   A transformation that "slides" each point of a figure the same distance in the same direction.  
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Transversal   A line that crosses two or more lines.  
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