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2.phi.r.(r+t) = 4092
2.22/7.r.(r+10) = 4092
44/7.r.(r+10) = 4092
44.r.(r+10) = 4092 . 7
44r²+440r = 28644
44r²+440r-28644 = 0
kdua ruas dibagikan dg 44, didapat :
r²+10r-651 = 0
(r-21).(r+31) = 0
r-21 = 0 → r = 21 cm
atau
r+31 = 0 → r = -31 cm
jadi, yg memenuhi adalah r = 21 cm