Ticket:
0.22mm thick
51.21mm thick
Annulus:
168.65mm (diameter) 84.325mm radius
22.77mm (diameter) 11.385mm radius
A)
A=pir^2
A=pi*84.325^2
A=22338.94055mm^2
A=pir^2
A=pi11.385^2
A=407.2076634mm^2
22338.94055mm^2-407.2076634mm^2=21931.733mm^2
B)
.22mm by 51.21mm
51.21*.22=12.1462mm^2
C)
21931.733mm^2/12.1462mm^2=1805.85 tickets