Make enlargements with and without centers. Pupils work through seven problems dealing with dilations or enlargements. The first couple items are strict enlargements without centers, while the others have centers. Class members also determine the dilation between two figures.

Concepts

dilations, transformations, scale factors, similar figures, similarity

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Additional Tags

math

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Instructional Ideas

• Lead a discussion on what scale factors make the image larger and what scale factors make the image smaller
• Conduct a lesson on how to find the image given the scale factor and the center of dilation

Classroom Considerations

• The video needed is the seventh in the playlist

Pros

• The presenter points out the difference in the area of the enlargement compared to the original object
• Uses red to show the image and the lines needed to dilate the pre-image

Cons

• None

Common Core

8.G.A.3 HSG-CO.A.2 HSG-CO.A.4 MP1 MP5 MP6