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Geometry Reflections

8th grade math<br>Reflection<br>

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Geometry Reflections

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  1. W Translations- Brainingcamp Lesson and Notes Translations Practice Worksheet DeltaMath Time • e • d TO DO LIST: Sharpen pencils Copy Agenda Complete the Warm-Up AGENDA: Reflection Lesson and Examples MIRA Activity Practice Problems & Reflection Rules OUTCOME: Students will be able to REFLECT two dimensional figures • n • e • s HOMEWORK: DeltaMath HW#3: due by Friday, May 6th • d • a • y

  2. Name- _______________________________________ Warm-Up 2.

  3. Name- _______________________________________ Warm-Up 2. Quadrant 2 Quadrant 1 X’ Y’ X’(-5, 5) Z’ Quadrant 1 Quadrant 3 Quadrant 4

  4. Reflections

  5. Model Lesson: Reflection 1.) Vertices of the triangle Vertices of reflected triangle over y-axis.

  6. 1.) Vertices of the triangle Vertices of reflected triangle over y-axis. (-2,6) (-4,3) (-4,9)

  7. 1.) Vertices of the triangle Vertices of reflected triangle over y-axis. A(-2,6) B(-4,3) C(-4,9) A’(2,6) B’(4,3) C’(4,9)

  8. Model Lesson: Reflection 2.) Vertices of the triangle Vertices of reflected triangle over x-axis.

  9. 2.) Vertices of the triangle Vertices of reflected triangle over x-axis. (3,-2) (6,-4) (9,-2)

  10. 2.) Vertices of the triangle Vertices of reflected triangle over x-axis. (3, -2) (6, -4) (9, -2) (3, 2) (6, 4) (9, 2)

  11. Plot the points on the grid. Draw the reflection on the grid below. Name the coordinates of the new polygon. How do the coordinates change? 3.) Rectangle of vertices at (2,3) (2,5) (4,3) (4,5) Vertices of reflected triangle over x-axis. What do notice about the points?

  12. 3.) Rectangle of vertices at (2,3)(2,5)(4,3) (4,5) Vertices of reflected triangle over x-axis. What do notice about the points?

  13. 3.) Rectangle of vertices at (2,3)(2,5)(4,3) (4,5) Vertices of the reflected rectangle over x-axis. What do notice about the points? (2,-3)(2,-5)(4,-3)(4,-5)

  14. 4.) Triangle of vertices at (3,0)(4,5)(1,8) Vertices of reflected triangle over y-axis. What do notice about the points?

  15. 4.) Rectangle of vertices at (3,0)(4,5)(1,8) Vertices of reflected triangle over y-axis. What do notice about the points?

  16. 4.) Rectangle of vertices at (3,0)(4,5)(1,8) Vertices of reflected triangle over y-axis. What do notice about the points? (-3,0)(-4,5)(-1,8)

  17. Reflections Let’s work with the Miras.

  18. Reflections Go back to your worksheet and check your results. Do they match up?

  19. Worksheet: Mirror Images Let’s practice!

  20. Transformational Geometry

  21. Practice Problems Transformational Geometry L (1,2) L’ (1, -2) When you reflect across the x-axis, the y-coordinate changes to its opposite. The x-coordinate stays the same. When you reflect across the y-axis, the x-coordinate changes to its opposite. The y-coordinate stays the same.

  22. Reflection Rule

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