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28 Cards in this Set
- Front
- Back
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A change in position, shape or size of a figure
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Transformation |
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pre-image
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original figure |
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Transformed geometric figure |
Image |
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Isometry |
Preimage and image are congruent |
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All points go the same distance in the same direction |
Translation
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Combination of multiple transformations |
Composition of Transformations |
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Line of Reflection
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The line that a figure is reflected across |
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All points of the preimage and image are equidistant from the same line |
Reflection |
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Reflection |
Transformed figures are mirror images of each other |
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Center of rotation |
All points of the figure are equidistant from this one point
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Rotation
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The geometric figure is turned around one point in this transformation |
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Angle of Rotation |
How many degrees the figure is rotated |
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A point equidistant from all vertices in a geometric figure |
Center |
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Line Symmetry |
A figure with two equal sides, left and right, like a human.
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If an image rotates 180 or less and doesn't change it has: |
Rotational Symmetry |
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Each segment joining a point and it's 180 rotation image passes through the center when there is:
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Point Symmetry |
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Point Symmetry
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If a figure has rotational symmetry, it also has: |
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Symmetry |
If isometry maps the figure onto itself. |
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Scale factor |
The ratio at which something is enlarged or reduced. |
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Dilation |
A shrinking or reduction of a geometric figure. |
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More than one reflection on a figure is |
Composition of Reflections |
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A type of reflection that combines a translation and a reflection. |
Glide Reflection |
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Tessellation |
Repeating pattern of figures |
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If the interior angles is a factor of 360, then the figure can |
Tesselate |
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(n-2)180
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Total degrees in a polygon |
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Measure of an interior angle of a regular polygon |
(n-2)180 / n |
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Regular polygon |
All side lengths and angles are congruent.
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A human being has what kind of symmetry
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Line Symmetry |
