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September 22, 2014

September 22, 2014

Posted by **Mathew** on Friday, February 15, 2013 at 3:26pm.

(a) the total area of the discs out

(b) the area of sheet wasted

I did it but the answers on the back of the book do not match

heres what i did

no. of complete discs = (84*24) / 16pi

= 40

(a) total area of disc cut = 40*16pi

(b) area of wasted sheet = (84*24)-(40*16pi)

= 2016 - 2010 = 6

please check if I made errors

- math -
**Steve**, Friday, February 15, 2013 at 4:00pmAssuming the discs (of diameter 8cm) are laid out in a rectangular grid, only 8 discs lie along the length, and the sheet is 3 discs wide.

That makes 30 discs.

If you want to change the layout, you can probably fit more discs, but you will never get 40 of them.

- math -
**Steve**, Friday, February 15, 2013 at 4:01pmsorry - the sheet is 10 discs long (not 8)

- math -
**Mathew**, Friday, February 15, 2013 at 4:02pmthanks

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