Chapter 7 Vocab. Flashcards
Compares three (or more) numbers
Extended ratio
An equation that states two ratios are equal
Proportion
The first and last numbers in a proportion
Extremes
The middle two numbers
Means
In a proportion, the product of the extreme equals the product of the means
Cross products property
Have the shape but not necessarily the same size
Similar figures
Two polygons are _____ if corresponding angles are congruent and if the lengths of corresponding sides are proportional
Similar polygons
When three or more ratios are equal
Extended proportion
The ratio of corresponding linear measurements of two similar figures
Scale factor
All lengths are proportional to their corresponding actual lengths
Scale drawing
The ratio that compares each length in the scale drawing to the actual length
Scale
You can use _______ to find lengths that are difficult to measure directly
Indirect measurement
The _____ of a and b is the positive number x such that a/x = x/b
Geometric mean
A comparison of two quantities by division.
Ratio
Two polygons are similar polygons of corresponding angles are congruent and if the lengths of corresponding sides are proportional
Similar polygons
