Generally speaking, the size of the flag should be considered according to various factors such as the size of the performance venue, the proximity of the audience and the number of performers. If the performance venue is large, the flag can be made bigger accordingly so that the audience can see it from a distance. If the performance venue is small, the flag can be reduced accordingly, so as not to let the audience feel that the flag is too large and produce visual oppression.
At the same time, the size of the flag should also take into account the number of performers. If the number of people, the flag can be correspondingly more, the size can also be slightly larger. If the number of people is small, the number of flags can be reduced accordingly, and the size can also be reduced accordingly.
Overall, there is no fixed standard for the size of the flags, it needs to be decided according to the actual situation. It is recommended that you consider the actual needs and the size of the performance venue and other factors, or consult an experienced dancer or instructor for more specific advice.