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Published byMagdalene Byrd Modified over 9 years ago
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Warm-Up What is the scale factor of ABC to DEF?
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Similarity – Day 7 Dilations
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Dilation Practice
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Dilation Nonrigid transformation in which the image and preimage are similar. Center C and scale factor k: If P is not the center point, then P’ lies on CP. If P is the center point, then P=P’
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Dilation Nonrigid transformation in which the image and preimage are similar. Center C and scale factor k
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Dilation Reduction if 0 < k < 1. Enlargement if k > 1.
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Example 1: Identify the dilation and its scale factor.
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Example 2: Identify the dilation and its scale factor.
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Example 3: X(1, 4) Y(1, 1) Z(5, 1)
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Example 4: A circle in a photocopier enlargement has a 6 in diameter. If the enlargement is 125% of the original, what is the diameter of the image of the circle?
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Guided Practice
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Drawing a dilation Draw a triangle and label it PQR.
Make a point outside of the triangle and name it C. Use the ruler to draw rays from C through the vertices of the triangle. Use the compass to locate P’ on CP so that CP’ = 2(CP). Repeat for Q’and R’. Connect the points P’, Q’, and R’. P’ Q P R C
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Homework
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