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Question

Which of the following cannot be the angle of rotational symmetry of a regular polygon?


A

40

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B

72

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C

180

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D

120

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Solution

The correct option is C

180


The angle of rotation of a 'n' sided regular polygon is given by 360n.

We know that minimum value of n is 3 as the minimum number of sides required to make a polygon is 3.
Also, 3603=120.
The angle of rotational symmetry of a regular polygon will always be less than or equal to 120.


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