Geometry Final Ch. 12
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Created by:
rob_lowman on May 30, 2012
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12 terms
Terms | Definitions |
|---|---|
 isometry | transformation that does not change the shape or size of a figure (reflection, translation, rotation) |
| image | reflected figure |
| preimage | original figure |
| (x, y)→(x, -y) | reflection across the x-axis |
| (x, y)→(-x, y) | reflection across the y-axis |
| (x, y)→(y, x) | reflection across the line y = x |
| translation | transformation where all the points of a figure are moved the same distance in the same direction |
| rotation | transformation that turns a figure around a fixed point, called the center of rotation |
| dilation | transformation that changes the size of a figure but not the shape |
| tessellation | a repeating pattern that completely covers a plane with no gaps or overlaps |
| regular | a ___ tessellation is formed by congruent regular polygons |
| semiregular | a ___ tessellations formed by two or more different regular polygons with the same number of each polygon occurring in the same order at every vertex |
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