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Reflections

Reflections. Chapter 3 Section 7. Reflections. A reflection – is a transformation that flips an image over a line. This line is called the line of reflection . Written R line (P) = P. R y-axis (C) = C’. Example. P(-1, 2) 1. R x-axis (P) =? 2. R y-axis (P)= ? 3. R y=1 (P)=?.

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Reflections

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  1. Reflections Chapter 3 Section 7

  2. Reflections A reflection – is a transformation that flips an image over a line. • This line is called the line of reflection. • Written Rline(P) = P • Ry-axis(C) = C’

  3. Example P(-1, 2) 1. Rx-axis(P) =? 2. Ry-axis(P)= ? 3. Ry=1(P)=?

  4. Example A(3, -2) 1. Rx-axis(A) =? 2. Ry-axis(A)= ? 3. Ry=1(A)=?

  5. Example ABC has vertices A(1, 1), B(1, 6) and C(4, 1). Ry-axis(ABC)

  6. Example LMN has vertices L(0, 0), M(3, -5) and N(-2, -2). Rx-axis(LMN)

  7. Example ABC has vertices A(0, 2), B(3, 0) and C(6, 3). 1. Rx-axis(ABC) 2. Ry-axis(ABC)

  8. Find the coordinates of the image for each reflection: Rx-axis(A) Ry-axis(B) Ry-axis(F) Rx-axis(E)

  9. Draw the Image for Each Reflection ABC has vertices A(2, 0), B(2, 5) and C(6, 5). 1. Rx-axis(ABC) 2. Ry-axis(ABC)

  10. Reflectional Symmetry A figure has reflectional symmetry if it can be reflected over a line so that the image and pre-image match up • The line that divides a figure up into mirror images is called the line of reflection. Example:

  11. How many lines of symmetry does each letter have? • E • B • X • P

  12. Do the flags have reflectional symmetry? • 2. 3.

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