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Dit : Luas permukaan kubus (L).....?
K = 4s
20 = 4s
s = 20/4
s = 5cm
L = 6s²
L = 6 x 5²
L = 6 x 25
L = 150cm²
s= 20/4
=5
luas permukaan kubus = 6 sxs
=6 x 5 x 5
=150