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750 = (3x × 2x) × x
750 = (6x²) × x
750 = 6x³
x³ = 125
x = 5
Panjang = 3x = 15 cm
Lebar = 2x = 10 cm
Tinggi = x = 5 cm
Lp = 2 × La + Ka × tinggi
= 2 (15 × 10) + (15 + 15 + 10 + 10) × 5
= 2 (150) + (50) × 5
= 300 + 250
= 550 cm²