This site talks about the different math in ballet. This site uses many examples. There are examples such as Rhythm in ballet, symmetry, geometry, and more. It shows pictures as examples. If a dancer is off symmetry then they could lose balance and get injured. If a dancer isn’t counting then he or she will be off time with the rest of the dancers. There are also several angles in dance and dancers form shapes with their bodies.
This site was helpful because it was like one of the previous sites I used except this site had more details. This site actually explained why they thought math was in ballet. This site also showed different dances and not just ballet. There was also tap, because rhythm in tap is very important. If you’re off beat in tap then your taps will just sound like noise.