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7700=πr²t
t= 7700
22/7.7/0.7/10
=7700.7/22.10/7.10/7
=5000 dm
=77/50
V = luas alas x tinggi
7.700=77/50xt
t = 7700/1 : 77/50
=7700/1 x 50/77
=5000