12.2. Rotation Symmetry http://www.ck12.org
Watch this video for help with the Examples above.
MEDIA
Click image to the left for use the URL below.
URL: http://www.ck12.org/flx/render/embeddedobject/52460CK-12 Foundation: Chapter12RotationSymmetryB
Concept Problem Revisited
The starfish has rotational symmetry of 72◦. Therefore, the starfish can be rotated 72◦, 144 ◦, 216 ◦, and 288◦and it
will still look the same. The center of rotation is the center of the starfish.
Vocabulary
Rotational symmetryis present when a figure can be rotated (less than 360◦) such that it looks like it did before the
rotation. Thecenter of rotationis the point a figure is rotated around such that the rotational symmetry holds. The
angle of rotationthat tells us how many degrees we can rotate a figure so that it still looks the same. In general, if a
shape can be rotated n times, the angle of rotation is^360
◦
n.