πh3(2R+r)
2R+r+πh3
πh3(2R2+r+2r)
2R23πh
Correct answer is A
V=πh3(R2+Rr+r2)
V=πR2h3+πRrh3+πr2h3
dVdR=2πRh3+πrh3
= π3(2R+r)
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