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The three types of symmetry are reflectional symmetry (mirror symmetry), rotational symmetry (turn-around symmetry), and translational symmetry (slide symmetry).
To find the smallest angle of rotational symmetry for a figure, divide 360 degrees by the number of rotational symmetries of the figure. The result will give you the smallest angle of rotational symmetry.
An optical axis is a line along which there is some degree of rotational symmetry in an optical system such as a camera lens or microscope..
An object that has only one line of symmetry is said to have bilateral symmetry. This means that it can be divided into two equal halves along one axis.
Io's rotational period, or the time it takes for the moon to complete one full rotation on its axis, is approximately 42.5 hours. This means that a day on Io lasts around 42.5 Earth hours.