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Master | Next Rank: 500 Posts
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by dunkin77 » Tue May 01, 2007 2:02 am
Hi,

for some reason my answer was C) but the correct answer is D) -- can anyone help?
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by Cybermusings » Tue May 01, 2007 8:53 am
972*pie = 4/3*pie*r^3
972 = 4/3*r^3
(972*3)/4 = r^3
729 = r^3
Thus r = 9

So 4*pie*r^2
=4*81*pie
= 324*pie
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