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Question

Find the order of rotational symmetry for a fan if it has three blades.
  1. 3


Solution

The correct option is A 3
Since the fan has three blades, the central angle is divided into 3 equal parts. This gives 3603=120.
Angle of rotation is the smallest angle for which the figure can be rotated to coincide with itself.
So, the degree of rotation of the fan  is 120.
Order of rotational symmetry =360minimum angle of rotation=360120=3

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