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luas permukaan balok 2 = 2 (p.l) + 2 (p.t) + 2 (l.t) = 2 (8x7) + 2 (8x4) + 2 (7x4) = 2 (56) + 2 (32) + 2 (28) = 112+64+56=232
perbandingannya yaitu
148 : 232
37 : 58