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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.