Download Presentation
## Rotations

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -

**Rotations**Unit 10 Notes**A rotation is a transformation in which a figure is turned**about a fixed point. The fixed point is called the center of rotation. Rays drawn from the center of rotation to a point and its image form an angle called the angle of rotation. The angle of rotation can be measured clockwise (CW) or counterclockwise (CCW).**Can you describe the rotation?**Is there only one way to describe the rotation?**A figure in the plane has rotational symmetry if the figure**can be mapped onto itself by a rotation of 180° or less.**Rotations about the origin**90° CCW about the origin 270˚ CW**Practice #1**Rotate ∆ABC with vertices A(2,-1) , B(4,1), and C(3,3) by 90° about the origin.**Practice #2**Rotate ∆ABC with vertices A(2,-1) , B(4,1), and C(3,3) by 180° about the origin.**Practice #3**B 90˚ CW rotation of about X 180˚ CCW rotation of about X 45˚ CCW rotation of ΔAXB A C X D H G E F**Classwork and Homework**Handout 7.3A and 7.3B