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30x³ = 810
x³ = 27
x= ∛27 = 3
panjang = 5x = 5 x 3= 15 cm
lebar = 3x= 3 x 3= 9 cm
tinggi = 2x = 2 x 3 = 6cm
Luas permukaan
depan belakang: Panjang x tinggi = 15 x 6 = 90
kiri kanan: lebar x tinggi = 9 x 6= 54
atas bawah = panjang x lebar = 15 x 9 = 135
Semoga bermanfaat