The top hoop is 10' by 9' but I'm just using the 10' measurement.
10' x12" = 120" minus the 20" center for the dancer=100" diameter divided by 2 = 50" This is the amount needed from the edge of the hoop to the dancer.
From the edge of the hoop to the floor is 6' x12=72"
I'm adding 1" for fabric curving over the PVC
4" at the bottom to attach the hem to the bottom hoop (this might be a Velcro strip)
3" at the top to fold over and put in grommets to thread a cord through and gather up the excess as the fabric comes into the center.
50" for radius at top
+72" from hoop to floor
+1" for the curve over the hoop
+4" for attaching to the bottom hoop
+3" for the top edge grommets
=130" or 10'10" for each panel.
120" wide white muslin means I'll need 3 panels.
(Circumference of the circle is diameter 10' x 3.14 which in this case is 31'.
Times that by 12 for inches =372"
Divide that by the width of the fabric =3.1 panels. This is a bit over 3 panels but the back isn't shown to the audience and if needed a strip of fabric could be added.
Final analysis: I will cut one panel of 10'10" and experiment with the top and bottom margins possibly making them a bit shorter if less is needed at the top or bottom attachment.