it is the number of times the shape is the same after you turn it without using any that are used yet
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turn symmetry is when you turn your shape a fraction of a way in a circle and it still makes the same shape
It is an equilateral triangle which has rotational symmetry
A square has 90° rotational symmetry.
Corundum crystals belong to the ditrigonal-scalenohedral class of the trigonal symmetry D63d - R 3-C(L33L23PC) with symmetry elements: • Mirror-turn axis of the sixth order (ternary inversion axis) • Three axes of the second order normal to it • Three symmetry planes normal to the axes of the second order and intercrossing along the axis of the highest order • Symmetry center
A figure has rotational symmetry if you can turn it about a figure.