Flashcards: Geometry (Part 1)
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Created by:
HMS7C on January 23, 2010
Subjects:
Description:
Transformations and Similar Figures
Groups:
STUDY GROUP | Everybody Welcome!, Geometry, HMS Gr. 7 Math Vocabulary
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Terms | Definitions |
|---|---|
 congruent | figures with same size and shape |
| corresponding parts | a pair of sides or angles in the same position on similar figures |
| reflectional symmetry | when a figure can be folded on a given line that divides it into two congruent parts |
| reflection | a flip across a given line |
| rotation | a turn around a given point with a given angle and direction |
| rotational symmetry | when a figure can be turned around a central point less than 360 degrees and it matches up with the original image |
| transformation | a change in the size or position of a figure |
| translation | movement of a figure along a straight line |
| similar figures | have the same shape but are not the same size |
| scale factor | a ratio used to enlarge or reduce similar figures |
| dilation | a transformation that changes the size of an image but not the shape. |
| ratio | a comparison of two numbers by division |
| proportion | an equation that states that two ratios are equal |
| rate | a ratio of two quantities with different units |
| enlargement | an increase in size of all dimensions in the same proportions and have a scale factor > 1 |
| reduction | a decrease in size of all dimensions in the same proportion and have a scale factor < 1 |
| unit rate | a rate simplified so the denominator is 1 (mpg, cost/item) |
| cross products | used to solve proportions or compare two ratios |
| indirect measurement | uses similar figures and proportions to find a missing measurement |
| scale | the ratio of a distance in a drawing to the actual distance |