Question

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

Solution

The correct option is A 3Since the fan has three blades, the central angle is divided into 3 equal parts. This gives 360∘3=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 =360∘minimum angle of rotation=360∘120∘=3

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