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= 2.5.3 + 2.5.2 + 2.3.2
= 62
volume balok=plt
810=5a.3a.2a
810=30a^3
810:30=a^3
27=a^3
a=3
jadi p =5.3=15, l=3.3=9, t=2.3=6
luas permukaan balok =2(pl+pt+lt)
=2(15.9+15.6+9.6)
=2(135+90+54)
=2(279)
=558 cm^2
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