Question 41925
Well 21 discs one way and 11 disks the other way can be cut...231 disks in total...let's find thier total area and subtract it from the area of the original sheet...
A = 231 * ((pi)r^2)
A = 231 * 16pi
A = 3696*pi sq cm
The original sheet was 90 x 170 or 15300 sq cm.
Now subtract to get the leftover area
Leftover = 15300 - 3696(pi) or about 3689 sq cm