Friday

August 22, 2014

August 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

**Related Questions**

math - A rectangular sheet of metal, of area 440 sq.cm is folded into a cylinder...

finite math - a box contains 40 computer disks, 5 are defective. Three disks are...

maths - how cards of side 5cm can you cut from a rectangular sheet of paper of ...

maths - how many square cards of side 5cm can you cut from a rectangular sheet ...

maths - from a rectangular piece of metal sheet of length and breadth 1.60 m and...

Physics - The figure shows three rotating, uniform disks that are coupled by ...

Physics please help????? - The figure shows three rotating, uniform disks that ...

Math - Sam needs to cut a piece of sheet metal into 8 pieces. All the cuts are ...

Maths - Hi im doing measurement at skool at the moment and i cant quite ork out ...

math - The length of an open-top box is 4 cm longer than its width. The box was ...