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810 = 30
x³ = 810/30
x³ = 27
X = 3
P = 5x3 = 15
L= 3x3 = 9
Lalas = 15x9= 135 cm²
V = 5x . 3x . 2x = 810
30 x³ = 810
x³ = 27
x = 3
p : l : t = 5 : 3 : 2 = 5x : 3x : 2x = 15 : 9 : 6
Luas bagian alas = p x l = 15 x 9 = 135 cm²