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Geometry worksheet to help students use cross products to determine if ratios of line segment lengths are proportional.
Geometry worksheet to help students solve proportions involving line segment lengths using cross-products.

Activity 3.8​

Assignment 3.9

​Assignment 6.2

​Proportion in Geometry

 
Objectives
Determine whether ratios of line segment lengths are proportional using cross-products.
 
Using a given proportional relationship of line segment lengths, substitute and solve for an unknown length. 
 
 
 
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About Geometry Worksheet Assignment 6.2:     

 

Assignment 6.2 is an introduction to proportion in geometry.  

 

Prerequisite Skills:  Identify lengths of line segments (Assignment 1.12). Solve algebraic equations with one variable.

 

Definitions:  A proportion is a statement of equality of two ratios.    a  =  c    .

                                                                                                                  b      d

                          The products of the numerator of one ratio and the denominator of another ratio are the cross-products of the ratios.

 

 

Theorems:  If the cross-products of two ratios are equal, the ratios are proportional.

                          In a proportion, the cross-products are equal.

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