thursday 9/11/14 warm – up: 1. what are the coordinates of h (-1, -2) after a rotation of 180...
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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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4 3 2 1 0In 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 theteacher, I have partial successwith 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 ReductionScale Factor:
Greater than 1Less than 1
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Is the dilation an enlargement or reduction from the shaded figure to the non-shaded figure.
Enlargement or ReductionScale Factor:
Greater than 1Less than 1
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Find the scale factor for the dilation from the solid figure to the dashed line figure.
164
4 = 16
1/4
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Find the scale factor for the dilation from the solid figure to the dashed line figure.
615
15 = 6
52
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Find the scale factor for the dilation from the solid figure to the dashed line figure.