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d = 10 cm
panjang balok = 10 + 10 + 10 = 30
lebar balok = 10
tinggi balok = 10
luas permukaan = 2(30 x 10 ) + 2(30 x 10 ) + 2( 10 x 10 )
= 600 + 600 + 200
= 1400