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.

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Presentation transcript:

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

Dilations Part 2

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.

Dilations make similar figures. Similar means:__________________________ Are the following figures similar? If so, how can you tell? Same Shape but Different Size No Yes

What is a scale factor?

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.

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

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

Find the scale factor for the dilation from the solid figure to the dashed line figure = 16 1/41/4

Find the scale factor for the dilation from the solid figure to the dashed line figure =

Find the scale factor for the dilation from the solid figure to the dashed line figure.