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maka
r = 2x
t = 3x
v = phi . r² . t
1617 = 22/7 . (2x)² . 3x
514,5 = 12x³
42,875 = x³
x = 3,5
jadi
r = 2 . 3,5 = 7 cm
t = 3 . 3,5 = 10,5 cm
lp = 2. phi . r (r +t)
lp = 2. 22/7 . 7 (7+10,5) = 770 cm²