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A point or a line segment can be a preimage of itself because a line can be reflected or rotated.
It is called a rotation.
Center of rotation
Point of rotation
Stock rotation ensures we always use the oldest stock first.The rotation of the Earth around the Sun takes one year.A farmer uses crop rotation to help keep the soil disease free.
This is the definition of "rotational symmetry", or if the statement is true for any number of degrees of rotation it is also "circular symmetry.".
Lateral Rotation of the leg or External Rotation is when the leg is rotated externally with toes turned outward or away from body's midline .
0, the angle is rotated about the origion
A vector rotation in math is done on a coordinate plane.2D vectors can be rotated using the cross and dot product.3D vectors are rotated using matrix based quaternion math.
Lateral Rotation of the leg or External Rotation is when the leg is rotated externally with toes turned outward or away from body's midline .
A transformation, in the form of a rotation requires the centre of rotation to be defined. There is no centre of rotation given.