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Question

If a fan has 3 blades, then its degree of rotation is _____.


A

90

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B

120

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C

150

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D

180

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Solution

The correct option is B

120


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.


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