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Thursday 9/11/14 Warm – Up: 1. What are the coordinates of H (-1, -2) after a rotation of 180 degrees clockwise? 2. Point A (8, -4) is reflected over the x-axis. What are the coordinates of A’? 3. Write a rule for the given translation. 4. What is a dilation? Materials: - HW From Last Night - Loose Leaf Paper for Warm – Up - Pen & Pencil 3 Songs to Unpack and Finish Warm - Up
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Dilations Part 2
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43210 In addition to level 3.0 and above and beyond what was taught in class, I may: Make connection with real-world situations Make connection with other concepts in math Make connection with other content areas. I understand and use informal arguments to prove congruency and similarity using physical models, transparencies or geometry software. informally prove similarity of triangles Use scale factors to create and analyze dilations. I understand congruency and similarity using physical models, transparencies or geometry software. construct triangles Calculate dilations with scale factors. With help from the teacher, I have partial success with the unit content. Even with help, I have no success with the unit content. Learning Goal 1 (8.G.A.3 & 4): The student will understand and use informal arguments to prove congruency and similarity using physical models, transparencies or geometry software.
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Dilations make similar figures. Similar means:__________________________ Are the following figures similar? If so, how can you tell? Same Shape but Different Size No Yes
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What is a scale factor?
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This is a Dilation… 3 5 How do you find the scale factor? Take the second figure’s size and divide it by the first figure’s size.
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Is the dilation an enlargement or reduction from the shaded figure to the non-shaded figure. Enlargement or Reduction Scale Factor: Greater than 1 Less than 1
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Is the dilation an enlargement or reduction from the shaded figure to the non-shaded figure. Enlargement or Reduction Scale Factor: Greater than 1 Less than 1
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Find the scale factor for the dilation from the solid figure to the dashed line figure. 16 4 4 = 16 1/41/4
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Find the scale factor for the dilation from the solid figure to the dashed line figure. 6 15 15 = 6 5252
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Find the scale factor for the dilation from the solid figure to the dashed line figure.
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