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HousekeepingYesterday we discussed reflections.

Did you complete IXL Skills Q.4 & Q.5???

A. A horizontal translation 2 units to the rightB. A vertical translation 2 units downC. A reflection across the x-axisD. A reflection across the y-axis

Transformations- Translations (slide)- Reflections (flip)- Rotations (turn)- Dilations (zoom)

Goal for today….

Learn to transform plane figures using rotations.

A rotation turns a figure around a point, called the center of rotation.

Example: Graphing Rotations on a Coordinate PlaneGraph the rotation of triangle ABC 90 counterclockwise about the origin.Multiply the y-coordinate of each vertex by –1, and switch the x and y coordinates.

Rule ImageA(4, 4)A’ (–1 4, 4 ) A’(–4, 4)B(4, 1)B’ (–1 1, 4) B’(–1, 4)C(2, 1)C’ (–1 1, 2) C’(–1, 2)

A’ B’

C’

Wrap UpToday we learned to transform plane

figures using rotations.

Questions?

What now?*IXL Q.6*IXL Q.7