November 25, 2015

Homework Help: math

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

Disks of radius 4 cm are cut from a rectangular plastic sheet of length 84 cm and width 24 cm. How many complete disks can be cut out? Find
(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

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