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Dilations

Dilations. Section 9.7. Dilation. A dilation is a transformation that stretches or shrinks a figure to create a similar figure. A dilation is not an isometry . Scale Factor of Dilation.

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Dilations

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  1. Dilations Section 9.7

  2. Dilation A dilation is a transformation that stretches or shrinks a figure to create a similar figure. A dilation is not an isometry.

  3. Scale Factor of Dilation The scale factor of a dilation is the ratio of a side length of the image to the corresponding side length of the original figure.

  4. Reduction A reduction is any dilation where the image is smaller than the original figure. The scale factor of a reduction is less than 1.

  5. Enlargement An enlargement is any dilation where the image is larger than the original figure. The scale factor of an enlargement is more than 1.

  6. Find the scale factor of the dilation . Then tell whether the dilation is a reduction or enlargement.

  7. Graph the triangle with points A (1, 2), B(3, -4) and C (-2, 3). Then dilate the triangle with a scale factor of 2.

  8. Assignment • p.629: 3-5, 7-14

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