Jawabanmu

2014-05-22T04:08:06+07:00
1920 cm³ = 5n×3n×2n
1920 cm³ = 30n³
n = √1920 cm÷30
n = √64 cm
n = 8

LP = 2 × (40×20+40×16+24×16)
LP = 2× (960+640+384)
LP = 2× 1984
LP = 3.968 cm²