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diagonal sisi²=p²+l²
12²+10²=ds²
144+100=244
ds=√244
diagonal ruang=ds²+t²
t²=dr²-ds²
t²=269-244
t²=25
t=5
maka luas balok (luas permukaan)=2(pl+pt+lt)
2(12.10+12.5+10.5)=2.230=460 cm²