Vocabulary
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| Transformation | A geometric figure is a function, or mapping that results in a change in the position, shape, or size of the figure.
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| Preimage | The original image of a transformation.
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| Image | The resulting image of a transformation.
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| Rigid Motion | A transformation that preserves distance and angle measures.
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| Translation | A transformation that maps all points of a figure the same distance in the same direction.
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| Composition of Transformations | A combination of two or more transformations.
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| Reflection | When you reflect a figure the shapes have opposite orientations.
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| Line of a Reflection | A transformation with the following properties: if a point A is on line m, then the image of A is itself (that is, A' = A); if a point B is not on line m, the m is the perpendicular bisector of line BB'.
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| Rotation | Preserve distance, angle measures, and orientation of figures.
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| Center of Rotation | A transformation with these two properties: the image of Q is itself (that is, Q' = Q) and for any other point V, Qv' = QV and m<VQV' = x.
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| Angle of Rotation | The number of degrees a figure rotates.
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| Symmetry | A figure has symmetry if there is a rigid motion that maps the figure onto itself.
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| Line Symmetry/Reflectional Symmetry | If there is a reflection for which the figure is its own image.
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| Line of Symmetry | The line of reflection.
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| Rotational Symmetry | If the image, after a rotation of less than 360 degrees, is exactly the same as the original figure.
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| Point Symmetry | If a 180 degree rotation about a center of rotation maps the figure onto itself.
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| Glide Reflection | The composition of a translation (a glide) and a reflection across a line parallel to the direction of a translation.
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| Isometry | A transformation that preserves distance, or length.
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| Congruent | Two figures are congruent if and only if there is a sequence of one or more rigid motions that maps one figure onto the other.
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| Congruent Transformation | Also know as Isometry, is a transformation in which an original figure and its image are congruent.
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| Dilation | A transformation (notation) that produces an image that is the same shape as the original, but is a different size. A dilation stretches or shrinks the original figure.
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| Center of Dilation | A fixed point in the plane about which all points are expanded or contracted. The only invariant point under a dilation.
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| Scale Factor of a dilation | The ratio of any two corresponding lengths in two similar geometric figures. Note: the ratio of areas of two similar figures is the square of the scale factor. The ratio of volumes of two similar figures is the cube.
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| Enlargement | A dilation is an enlargement if the scale factor n is greater than 1.
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| Reduction | The dilation is a reduction if the scale factor n is between 0 and 1.
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| Similarity Transformation | A composition of a rigid motion and a dilation.
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| Similar | Resembling without being identical.
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