what is the order of rotational symmetry of a ceiling fan with three blades when seen from directly under the fan?
Dear Student,
The order of symmetry will be 3.
Order of symmetry of any figure is determined by the number of positions it looks exact same. In case of fan with 3 blades as in the figure below, the 3 dotted lines explains 3 positions, from where it is same.

Hope this will help you.
Regards,
The order of symmetry will be 3.
Order of symmetry of any figure is determined by the number of positions it looks exact same. In case of fan with 3 blades as in the figure below, the 3 dotted lines explains 3 positions, from where it is same.

Hope this will help you.
Regards,