 # Warm Up Draw an example of a reflection: Draw an example of a figure that has one or more lines of symmetry: Find the new coordinates of the image after.

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Warm Up Draw an example of a reflection: Draw an example of a figure that has one or more lines of symmetry: Find the new coordinates of the image after being reflection over the x-axis:(2, -3)(5, -4)(3, -5)

Chapter 13.6 Rotation Center of rotation Angle of rotation

Determine angle of rotation

Using coordinate notation to describe a 90 degree rotation 90° clockwise rotation (x,y)  (y, -x) *Switch the coordinates, then multiply the new y- coordinate by -1

Using coordinate notation to describe a 90 degree rotation 90° counterclockwise rotation (x,y)  (-y, x) *Switch the coordinates, then multiply the new y- coordinate by -1

Using coordinate notation to describe a 180 degree rotation 180° clockwise rotation (x,y)  (-y, -x) *simply multiply each coordinate by -1

Rotational symmetry A figure has rotational symmetry if a rotation of 180° or less clockwise (or counterclockwise) about its center produces an image that fits exactly on the original figure.

Homework Page 744 #’s 1-18

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