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s^3=1000
s=10
p=2s
p=20
t=1/2 l
l=2t
Vk=Vb
1000=plt
1000=20.2t.t
25=t^2
t=5
l=2t
l=10
Maka Luas permukaan balok
LP=2(pl+pt+lt)
LP=2(20.10 + 20.5 + 10.5)
LP=700
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