Question 1137548
A block of metal is melted and cast into a solid cylinder whose volume is 10cm^3. Show that the cylinder has a minimum surface area when r = 3* root 5 over pi.
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{{{r = 3*sqrt(5)/pi}}}
Or {{{r = 3*sqrt(5/pi)}}}
Which is it?
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If the ends are included:
{{{SA = 2pi*r*h + 2pi*r^2}}}
Are the ends included?
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