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= (5x * 3x * 2x)
= 30x³
30x³ = 810
x³ = 810 / 30
x³ = 27
x = ∛27
x = 3
panjang = 3 * 5 = 15 cm
lebar = 3 * 3 = 9 cm
tinggi = 3 * 2 = 6 cm
luas permukaan = 2 (pl + pt + lt)
= 2 ((15)(9) + (15)(6) + (9)(6))
= 2 (135 + 90 + 54)
= 2 (279)
= 558 cm²