Is it bigger, or is it smaller—or maybe it's the same size? Individuals learn to describe enlargements and reductions and quantify the result. Lesson five in the series connects the creation of a dilated image to the result. Pupils understand that the ratio used to create the dilation is the scale factor of the image. 

Concepts

scale factors, dilations, theorems, geometric proofs

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Additional Tags

math

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Instructional Ideas

• Form collaborative groups and assign different practice problems; have each group present their problem to the entire class
• Instruct pupils to use graph paper to help find measurements

Classroom Considerations

• Learners should already be comfortable with the concept of a dilation and how to create a dilation

Pros

• The lesson scaffolds the examples to lead to the desired concept
• Includes an opening activity and exit ticket along with independent practice problems

Cons

• None

Common Core

HSG-SRT.A.1.a HSG-SRT.B.4 HSG-MG.A.3 MP3 MP8