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45 cm² = t . l
40 cm² = p . l
72 dan 45 adalah faktor dari 9
karena t ada di antara kedua bialang tsb jadi t = 9
72 cm² = p . 9 = 8
p = 8
45 cm² = l . 9 = 5
l = 5
40 cm² = p . l
= 8 . 5 (benar)
jadi, V = p . l . t
= 8 x 5 x 9
= 360 cm³