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P x L x T = 810
5x * 3x * 2x* = 810
30x³ = 810
X³ = 27
x = 3
P = 5 x 3 = 15
L = 3 x 3 = 9
t = 2 x 3 = 6
Luas Permukaan = 2( PL + PT + LT)
= 2 (15x9 + 15x6 + 9x6)
= 2 ( 135 + 90 + 54)
= 2 (279)
= 558 cm³