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= 18 : 2
= 9
tinggi trapesium
volum = La x t
= (a+b) x t : 2 x t
= ( 39 + 21) x 12 : 2 x 60
= 60 x 6 x 60
= 21600 dm³
= 21600 liter
jawabnnya 21600 liter