http://209.85.48.8/9963/162/upload/p2222876.jpg

Not sure how to do the last bit, help please.

Note: The cover is sometimes referred as a lid for some reason.

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- Dec 2nd 2010, 10:52 PMCthulFinding the minimum cost for a semi-circular cover
http://209.85.48.8/9963/162/upload/p2222876.jpg

Not sure how to do the last bit, help please.

Note: The cover is sometimes referred as a lid for some reason. - Dec 2nd 2010, 11:04 PMUnknown008
You didn't show the right equation for part (c)... =/

Area of two end sections =

Area of body of cover = [/tex]

Cost of end sections =

Cost of body =

Total cost =

Now,

Hence, cost =

4. I hope that you know some calculus... you'll have to find then solve for r. - Dec 2nd 2010, 11:23 PMCthul
I know how to do calculus. Thanks.