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9-6 Dilations

Learn about dilations, enlargements, and reductions in geometry, determine scale factors, and practice graphing dilations. Example problems included for classwork/homework.

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9-6 Dilations

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  1. 9-6 Dilations Vocab: Dilation: A transformation that changes the size of the shape Enlargement: A dilation that makes a shape bigger (scale factor greater than 1) Reduction: A dilation that makes a shape smaller (scale factor smaller than 1, but greater than 0)

  2. Determining Scale Factor • Scale Factor = dilation length/original length • r means scale factor in this book • Ex 1: Find the scale factor if BA is 4 and B’A’ is 12

  3. Graphing Dilations • Ex 2: Graph A(–2, –2), B(–1, 2), C(2, 1); r = 2 • Ex 3: Graph A(0, 0), B(3, 3), C(6, 3), D(6, –3); r = 1/3

  4. Classwork/Homework • P. 678 16-26 even not 20

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