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28 = 4s, maka 28 :4 = 7 cm sisi kubus
maka luas permukaan kubus adalah 6 x s kuadrat ( s x s )
6 x 7 x 7 = 294 cm2
28 = 4 x s
28/4 = s
7 cm = s
>luas kubus = 6 x s x s
Lkbs = 6 x 7 x 7
Lkbs = 6 x 49
Lkbs = 294 cm²
kayak gini bukan?