Identify whether or not a shape can be mapped onto itself using rotational symmetry.Describe the rotational transformation that maps after two successive reflections over intersecting lines.Create a transformation rule for reflection over the x axis. While most rotations will be centered at the origin, the center of rotation will be indicated in the problem (or in the notation). ![]() Describe and graph rotational symmetry. The general rule for rotation of an object 90 degrees is (x, y) -> (-y, x).In the video that follows, you’ll look at how to: The order of rotations is the number of times we can turn the object to create symmetry, and the magnitude of rotations is the angle in degree for each turn, as nicely stated by Math Bits Notebook. And when describing rotational symmetry, it is always helpful to identify the order of rotations and the magnitude of rotations. This means that if we turn an object 180° or less, the new image will look the same as the original preimage. The -90 degree rotation is the rotation of a figure or points at 90 degrees in a clockwise direction. ![]() Lastly, a figure in a plane has rotational symmetry if the figure can be mapped onto itself by a rotation of 180° or less.
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