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p = 20 cm
l = 15 cm
Luas yg diarsir = 120 cm²
Ditanya :
V = ... ?
Jawab :
Luas yg diarsir = l x t
120 = 15 x t
t = 120/15
t = 8 cm
V = p x l x t
= 20 x 15 x 8
= 2.400 cm³