Example: using a blueprint or scale drawing of a house to determine the amount of carpet to be purchased
 

Exploring Similarity Using Scale Drawings
In this lesson, students will explore properties of similarity using models, measurement, and calculation.

Linking Length, Perimeter, Area and Volume
designed for students to understand ratio, proportion, scale factor, and similarity using perimeter and area of various rectangular shapes

Ratios of Perimeter and Area
This is a PowerPoint lesson on the similarity ratios for perimeter and area.

Can there be Giants?
This is a very hands-on lesson using proportions and ratios of perimeters, areas, and volumes of similar figures.  You may want to pull portions of this lesson to mix in with your instruction.

Chicago Public Schools
49 pages loaded with lesson plans, examples, and assessments.  You only need to stroll to this topic.

Review of Ratios of Perimeters, Areas, and Volumes of Similar Figures
This is a basic lesson with a practice link.

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