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## Rotations

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**Rotations**p. 12-13 8/15/13**Review- Left Side p. 12**1) Using point (1,2), complete the following transformation ( x, y )→( x - 2, y + 1 ) 2) Reflect A(-9, -3) over the y-axis. 3) Reflect B(-7, 0) over the y-axis.**Rotations p. 13**• Objective: Rotate figures in the coordinate plane.**Rotations**• A rotation is a 1)rigid transformation in which a 2)figure is rotated, or turned, about a fixed point. The3)center of rotation is the fixed point (0,0). A rotation does not change the size or shape of the figure.**Rotations are described using degrees and directions**• Degree: 90ᵒ, 180ᵒ, 270ᵒ • Direction: Clockwise or Counterclockwise**Rules**Clockwise Counterclockwise**Left Side Practice**• Use the point (-2,3) 1. Rotate counterclockwise 90 degrees 2. Rotate clockwise 180 degrees 3. Rotate counterclockwise 270 degrees • A triangle has vertices of A (0,0); B (3,0); and C (3,4) 4. Rotate the triangle 90 degrees counterclockwise about the origin. Name the the coordinates of the vertices using A‘, B‘, and C'