Unit 5, Lesson 8
Speaking of Scaling
Geometry
Preparation
Lesson Narrative
In this lesson, students apply their knowledge of the relationships between original and scaled figures. Students decide what information is necessary to move backward and forward between lengths, surface areas, and volumes of an original solid and its dilation. They communicate with each other to obtain the data they need to solve a problem. Then, in an optional activity, they create a mathematical model of a real-world situation.
As students persist in asking their peers for information, they are making sense of a problem (MP1).
- Coordinate scale factors for lengths, surface areas, and volumes.
- Let’s practice moving back and forth between scale factors for lengths, surface areas, and volumes.
- I can calculate scale factors for lengths, surface areas, and volumes if I’m given any one of the three factors.
Required Preparation
Activity 3
Optionally, obtain several cylindrical beverage cans of different shapes and sizes.
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