More Lessons for Grade 9

Math Worksheets

Videos, worksheets, games and activities to help Geometry students learn about transformations on the coordinate plane. In this lesson, we will look at rotation.

Geometry Rotation

A rotation is an isometric transformation: the original figure and the image are congruent. The orientation of the image also stays the same, unlike reflections. To perform a geometry rotation, we first need to know the point of rotation, the angle of rotation, and a direction (either clockwise or counterclockwise). A rotation is also the same as a composition of reflections over intersecting lines.

Describing and drawing rotations of simple shapes in the plane.

Learn to identify, graph, and describe rotations

This video reviews the rules used for rotating figures in a coordinate plane about the origin. At the 10:20 mark, there is a shortcut demonstrated that can be used to as an alternative method.

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