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224 = 28 . l
l = 8
luas permukaan = 2 (p.l + p.t + l.t)
= 2 (28.8 + 28.10 + 8.10)
= 2 (224 + 280 + 80)
= 2 (584)
= 1168 cm²
224 = 28 x lebar
lebar = 8 cm
Luas permukaan = 2(pl + pt + lt)
= 2(224 + 280 + 80)
= 2(584)
= 1168 cm²