A rose window is a generic term which is used to describe a circular window which has mullions radiating from the centre. These usually divide the circular window into equal partitions and so, the order of symmetry will be the same as the number of "petals" in the rose.
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It need not have any rotational symmetry or it can have 5.
The rectangle's rotational symmetry is of order 2. A square's rotational symmetry is of order 4; the triangle has a symmetry of order 3. Rotational symmetry is the number of times a figure can be rotated and still look the same as the original figure.
Rotational symmetry of order 1.
A line has 180 degrees rotational symmetry.
They have not got any rotational symmetry