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Chapter 7 Similarity
Unit 1 Geometry Chapter 7 Similarity
Vocabulary Word | Definition |
---|---|
Proportion | An equation stating that two ratios are equal |
Extremes | The outer values of a:b = c:d. (a and d are extremes) |
Means | The inner values of the proportion a:b=c:d. (b and c are the means) |
Cross products | The product of the means and the extremes. (ad = bc) |
Ratio | The comparison of two numbers using division |
Similar Figures | Figures that have the same shape but not necessarily the same size |
Similar Polygons | Corresponding angles are congruent and corresponding side lengths are proportional |
Similarity Ratio | The ratio of the lengths of the corresponding sides of two similar polygons |
Indirect Measurement | Any method that uses formulas, similar figures, or proportions to measure an object |
Scale Drawing | Representing an object as smaller or larger than its original size |
Scale | The ratio of any length in the drawing to the corresponding actual length |
Dilation | A transformation that changes the size of a figure but not its shape |
Scale Factor | How much a figure is enlarged or reduced |