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9.7 Dilations HW pg. 629 #321 odds 1 January 30, 2012 no Bellwork How many lines of symmetry does each figure have? 1. A Rhombus that is not a square. 2 2. Equilateral triangle. 3 Does the figure have rotational symmetry? If so, describe the rotations that map the figure onto itself. Yes; 72° , 144° 3. 4.

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Transcript of 9.7 notes

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9.7 Dilations

HW pg. 629 #3­21 odds 1

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no

BellworkHow many lines of symmetry does each figure have?

1. A Rhombus that is not a square. 2

2. Equilateral triangle. 3 Does the figure have rotational symmetry? If so, describe the rotations that map the figure onto itself.

Yes; 72° , 144°3. 4.

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Reduction: 0 < k < 1 Enlargement: k > 1

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Scalar Multiplication: multiplying a matrix by a scalar (real number)

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Using Matrices: Scale factor multiplied by polygon matrix

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HW pg. 629 #3-21 odds