Which of the following cannot be the angle of rotational symmetry of a regular polygon?
180∘
The angle of rotation of a 'n' sided regular polygon is given by 360∘n.
We know that minimum value of n is 3 as the minimum number of sides required to make a polygon is 3.
Also, 360∘3=120∘.
∴ The angle of rotational symmetry of a regular polygon will always be less than or equal to 120∘.