Does it matter how many points to dilate? The resource presents problems of dilating curved figures. Class members find out that not only do they need to dilate several points but the points need to be distributed about the entire curve to see the shape of the image. They also calculate the scale factor needed to reverse a dilation in this third installment of a 16-part series.

Concepts

dilation, dilations, scale, scale factors, circles, ellipses, coordinate plane

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Additional Tags

math

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Instructional Ideas

• Use geometry software to demonstrate the dilation of a circle
• Have the pupils verify the dilations of the circles by finding the lengths of the radii

Classroom Considerations

• Assumes individuals are familiar with the process of dilating a figure

Pros

• Example one provides diagrams of what happens if they don't dilate enough points
• Answer key includes a sample of dilations

Cons

• None

Common Core

8.G.A.3 MP6 MP8