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t balok + limas =18
10+ t limas =18
t limas = 10
vol limas = 1/3. 2(15.12+15.10+12.10) . 10
= 1/3.2 (180 +150 +120).10
= 1/3 .2 ( 450).10 = 2.150.10 =3000
volemnya = 4.800
klo salah sorry
vlimas =1/3 .(2.(p.l)+(p.t).(l.t).18
=5400
volume seluruhnya = 5400+1800
=7200
=15.12.10
=1800